| West Bengal, India. Abstracts The modern | | | | different procedures depending on the character |
| chemistry is based on the findings and thinking of | | | | and form of the chemical treatment and the |
| the people of historical age. If no one knows the | | | | substance chosen for this purpose; the substance |
| base and work of the previous on a subject, he | | | | being called the 'Noble Stone' or 'Philosopher's |
| or she could mere develop a new thought or | | | | Stone'. This may be excrements, or blood, or hair, |
| findings. For, a civilization must know its past. | | | | or eggs, or anything else. After the substance has |
| Hence, the present work is a small effort to find | | | | been specified, it is treated along certain lines |
| out the contribution of ancient Arabian and | | | | mentioned in their books. The result is an earthen |
| Egyptian scientists in the field of Chemistry. | | | | or fluid substance which is called Elixir. These |
| Different scientists of different school of thought, | | | | chemists think that if Elixir is added to silver which |
| correlating different streams of science being | | | | has been heated in a fire, the silver turns into |
| Chemistry as a main subject, are described in the | | | | gold. If added to copper which had been heated in |
| present work. Chemistry deals with the | | | | a fire, the copper turns into silver. The question |
| composition and properties of substances and the | | | | arises whether the metals are of specific |
| changes of composition they undergo. It has been | | | | differences, each constituting a distinct species, or |
| divided into Inorganic and Organic. The conception | | | | whether they differ in certain properties and |
| of this in modern Chemistry came from | | | | qualities and constitute different kinds of one and |
| al-Rãzi's classification of chemical | | | | the same species? Abü Nasr |
| substances into mineral, vegetable and animal. | | | | al-Färabi and his followers held the |
| Inorganic Chemistry, deals with the preparation | | | | opinion that the difference in metals is caused by |
| and properties of the elements, and their | | | | certain conditions such as humidity and dryness, |
| compounds, originally arose from the study of | | | | softness and hardness, and colours such as |
| minerals and metals, whereas Organic Chemistry, | | | | yellow, white and black. According to him the |
| which deals with carbon compounds, developed | | | | metals are different kinds of one and the same |
| through the investigation of animal and plant | | | | species. On the other hand, Ibn Sina and his |
| products. Prior to 1828 it was not possible to | | | | followers believed that metals have specific |
| synthesize organic substances from their | | | | differences and belong to different species, each |
| elements and, therefore, it was supposed that | | | | of which has its own differential and genus, like all |
| there existed fundamental difference between | | | | other species. According to Abü |
| Organic and Inorganic Chemistry. In 1828 F. | | | | Nasr al-Färãbi, it is |
| Wohler synthetically prepared urea, an organic | | | | possible to transform one metal into another, |
| substance; thereby revealing that there was no | | | | because it is possible to change their conditions. |
| fundamental difference between these two | | | | "Ibn Sinà thought that such transformation |
| branches of Chemistry. Since carbon compounds | | | | was impossible. His assumption is based on the |
| were numerous, their study separately made | | | | fact that specific differences in metals cannot be |
| under Organic Chemistry, and study of elements | | | | changed by artificial means. He believed that since |
| and non-carbon compounds included in Inorganic | | | | the metals are created by the Creator and |
| Chemistry'. (1) The earliest discoveries in Inorganic | | | | Determiner of things, God Almighty, and the |
| Chemistry were made in metallurgy, Materia | | | | mystery of their real character was utterly |
| Medica, painting, enameling, glazing, glass-making, | | | | unknown and could not be perceived, any |
| arts, etc. These arts, and many metals, | | | | attempt for transformation would be |
| compounds and alloys were known to the Arabs. | | | | meaningless". (18) Ancient Arabs' art of |
| Similarly, the discoveries in Organic Chemistry | | | | transformation of metals was based upon |
| were made in the arts of dyeing, tanning, the | | | | Hellenistic and Iranian traditions, but apparently the |
| manufacture of paper, in the study of fats, both | | | | main principles and the main operations were |
| of plant and animal origin, in medicine, etc. Thus | | | | already established long before the 12th century. |
| Chemistry had its sources in photo techniques, | | | | Before this century the Arabs had not only made |
| mineralogy, metallurgy, Materia Medica and | | | | many experiments, and produced several works |
| decorative arts. It is the product of transmutation | | | | on this art, but they had begun to doubt and |
| of baser metals into gold and philosophical | | | | criticise the most advanced theories concerning it. |
| thoughts of practical or theoretical interest. Finally, | | | | This proves that the standard of their chemical |
| it is the result of the study of the properties of | | | | thinking was advanced. The 12th and 13th |
| the substances. A Greek philosopher, Empedocles, | | | | centuries added very little to their knowledge |
| held the view that all the four elements, air, | | | | about the transformation of metals, but their |
| water, earth and fire, were the primal elements, | | | | research continued in various fields. The main |
| and that the various substances were made by | | | | chemical writer of this age was |
| their intermixing. He regarded them to be distinct | | | | Abu'l-Qãsim Muhammad al-Iraqi who |
| and unchangeable. Aristotle considered these | | | | flourished in the second half of the 13th century. |
| elements to be changeable i.e., one kind of matter | | | | He was an experimenter and a theorist. His works |
| could be changed into another kind. (2) | | | | represent the full development of the Arabic |
| Jábir ibn Hayyãn | | | | doctrine. (19) The 14th century was an |
| (Liatinized as Geber), a great Arabian Chemist of | | | | enlightened period when a group of intelligent |
| the 8th century A.C., modified the Aristotelian | | | | writers began to reject the idea of |
| doctrine of the four elements, and presented the | | | | transformation of metals by chemical means. One |
| so-called sulphur-mercury theory of metals. | | | | of such person was a historian, Rashid al-Din who |
| According to this theory metals differ essentially | | | | described such chemical practice in Mongol Persia |
| because of different proportions of sulphur and | | | | and expressed his distrust of such chemists. The |
| mercury in them. He also formulated the theory | | | | large encyclopaedic work Nukhbat al-Dahr of |
| of geologic formation of metals. Unlike his Greek | | | | al-Dimashqi contains, in part second, much |
| predecessors, he did not merely speculate, but | | | | information on metal, their properties, and |
| performed experiments to reach certain | | | | influences. (19) As usual in Arabic treatises, |
| conclusions. He recognized and stated the | | | | chemistry is mixed up with mineralogy and |
| importance of experimentation in Chemistry. He | | | | geology. (20) Even in their purely chemical |
| combined the theoretical knowledge of the | | | | researches on transformation of metals, the Arab |
| Greeks and practical knowledge of the craftsmen, | | | | chemists achieved by no means unimportant |
| and himself made noteworthy advance both in | | | | results. In their efforts to discover Elixir they |
| the theory and practice of Chemistry. | | | | often discovered new chemical processes, and hit |
| Jâbir's contribution to Chemistry is | | | | upon the catalytic properties of various |
| very great. He gave a scientific description of two | | | | substances. The pains, which they took in the |
| principle operations of Chemistry. One of them is | | | | search of gold, ultimately resulted in their great |
| calcinations which is employed in the extraction of | | | | contribution to the development of modern |
| metals from their ores. The other is reduction | | | | chemistry. The last important chemist of the 14th |
| which is employed in numerous chemical | | | | century was 'Izz al-Din 'Ali Ibn al- Jildaki. Some |
| treatments. He improved upon the methods of | | | | twenty treatises are ascribed to him. The list |
| evaporation, melting, distillation, sublimation and | | | | shows al-Jildaki's great activity as a chemical |
| crystallization. These are the fundamental | | | | writer. A complete study of his vast writings is |
| methods employed for the purification of chemical | | | | necessary to know what he actually tried to |
| substances, enabling the chemist to study their | | | | establish. To some extent, this study was made |
| properties and uses, and to prepare them. The | | | | by Ruska, Stapleton, Holm yard, and their disciples. |
| process of distillation is particularly applied for | | | | One of al-Jildaki's important books entitled |
| taking extract of plant material. In the opinion of | | | | Nihâyat al-Talab fi Sharh al-Muktasab |
| JÃ bir the cultivation of gold was not the | | | | contains many quotations from the earlier works, |
| only object of a chemist. The preparation of new | | | | and some novelties, as the use of nitric acid to |
| chemical substances was also regarded by him as | | | | extract silver out of the gold-silver alloy. Al- Jildaki |
| the chief object of Chemistry. We owe to him | | | | remarked that the substances do not react |
| for the first preparation of such substances as | | | | except by definite weights. (21) This is one of the |
| arsenic and antimony from their sulphides, and | | | | four fundamental laws of modern chemistry. The |
| basic lead carbonate. He also did important work in | | | | ancient chemists applied their chemical knowledge |
| the preparation of steel, and the refinement of | | | | to a large number of industrial arts. Only three |
| metals. JÃ bir also deals with such | | | | such arts are mentioned here, which will enable |
| applications as the use of manganese dioxide in | | | | the readers to estimate the extent of their |
| glass-making, varnishes to water-proof cloth and | | | | knowledge of Applied Chemistry. Paper: Paper |
| protect iron use of iron pyrites for writing in gold | | | | was invented by the Chinese who prepared it |
| and distillation of vinegar to concentrate acetic | | | | from the cocoon of the silkworm. Some |
| acid. The most important discovery made by Jabir | | | | specimens of Chinese paper extant date back to |
| was the preparation of sulphuric acid. The | | | | the second century A.C. The first manufacture of |
| importance of this discovery can be realized by | | | | the paper outside China occurred in Samarqand |
| the fact that in this modern age the extent of | | | | (757). When Samarqand was captured by Arabs |
| the industrial progress of a country is mostly | | | | the manufacture of paper spread over the whole |
| judged by the amount of. sulphuric acid consumed | | | | Arab world including the Maghrib. (Tunis, Morocco, |
| in that country. Another important acid prepared | | | | Algiers). |
| by him was nitric acid which he obtained by | | | | By the end of the 12th century there were four |
| distilling a mixture of alum (of Yemen) and copper | | | | hundred paper mills in Fasalone. In Spain the main |
| sulphate (of Cyprus). Then by dissolving | | | | centre of manufacture of paper was Shatiba |
| ammonium chloride into this acid, he prepared | | | | which remained a ancient Arab city until 1239. |
| aqua regia which, unlike acids, could dissolve gold in | | | | Cordova was the centre of the business of paper |
| it. Jabir classified chemical substances, on the basis | | | | in Spain. The Arabs developed this art. They |
| of some distinctive features, into bodies (gold, | | | | prepared paper not only from silk, but also from |
| silver, etc.) and souls (mercury, sulphur, etc.) to | | | | cotton, rags and wood.In the middle of the 10th |
| make the study of their properties easier. | | | | century the paper industry was introduced in |
| Jãbir is the author of a large number | | | | Spain. In Khurasan paper was made of linen. |
| of books on chemistry and a book on astrolabe. | | | | There is an early treatise dealing with |
| About one hundred chemical works ascribed to | | | | paper-making, the Umdat al-Kuttab wa 'Uddatu |
| him are extant. His fame chiefly rests on his | | | | dhawi'l-Albãb which is ascribed to the |
| chemical books preserved in Arabic. (3) We find | | | | Amir al- Mu'izz' Ibn Badis, a ruler of the Zayri |
| that the author recognized and stated clearly the | | | | dynasty (1015-61) in Tunis. The 11th chapter of |
| importance of experimentation more clearly than | | | | this treatise, dealing with paper, has been edited, |
| any other early chemist. He remarkably sound | | | | translated and elaborately discussed by the |
| views on methods of chemical research. It is | | | | foremost student of Arabic paper, Josef |
| impossible to reach definite conclusions regarding | | | | Karabacek. This work explains how to prepare |
| the extent of his contributions until all the Arabic | | | | the pulp, make the sheets, wash and clean them, |
| writings ascribed to him have been properly | | | | colour, polish and paste them, and give them an |
| edited and studied. But on the basis of our | | | | antique appearance. No text comparable to this in |
| present knowledge, Jabir appears to be one of | | | | any other language of so early a date is known. |
| the greatest scientist whose influence can be | | | | The preparation of pulp involves a large number |
| traced throughout the whole period of the | | | | of complicated chemical processes, which shows |
| historical development of the Arabian and | | | | the advancement of the chemical knowledge of |
| European chemistry. In the light of these facts it | | | | the Arabs and Egyptians at that time. The |
| would not be improper to call Jãbir as | | | | manufacture of writing-paper in Spain is one of |
| the father of Chemistry. Some of the chemical | | | | the most beneficial contributions of Arabs to |
| writings to which Jãbir's name is | | | | Europe. Without paper the scale on which popular |
| attached were translated into Latin. The first such | | | | education in Europe developed would have not |
| version, the Book of the Composition of Alchemy | | | | been possible. The preparation of paper from silk |
| was made by Robert of Chester in 1144. The | | | | would have been impossible in Europe due to the |
| Kitab al-Sab'in (the book of the seventy) was | | | | lack of silk production there. The Arabs method |
| translated by Gerard of Cremona in the 12th | | | | of producing paper from cotton could only be |
| century'. The translation of the Sum of Perfection | | | | useful for the Europeans. After Spain the art of |
| was made by Richard Russell. One of his books | | | | paper-making was established in Italy (1268-76). |
| has been translated into French by Berthelot. (4) | | | | France owed its first paper mills to ancient Spain. |
| Several technical terms have passed from | | | | From these countries the industry spread |
| Jãbir's Arabic writings through Latin | | | | throughout Europe. Another type of paper; |
| into the European languages. Among these are | | | | marbled paper, which was common upon |
| realgar (red sulphide of arsenic), tutia (zinc oxide), | | | | end-papers, paper covers and edges of books, |
| alkali, antimony, and alembic for distillation Vessel. | | | | was prepared in the East, and exported to the |
| The Arabic equivalents for the last three words | | | | West. About the preparation of marbled paper |
| are alqali, ithmad, and al-'anbiq respectively. (5) | | | | Roger Bacon tells us: "The Turks have a pretty |
| Before Jãbir Ibn Hayyan, the | | | | art of chamoletting of paper, which is not with us |
| Umayyad prince Khalid Ibn Yazid, who was a | | | | in use. They take diverse oiled colours, and put |
| philosopher, poet and chemist, encouraged Greek | | | | them severally (in drops) upon water; and stirr |
| philosophers in Egypt to translate Greek scientific | | | | the water lightly and then wet their paper (being |
| works into Arabic. These were among the earliest | | | | of some thickness) with it, and the paper will be |
| translations in Arabic from other languages. He | | | | waved, and veined, like Chamolet or Marble'. |
| was himself deeply interested in medicine, | | | | Books bound in the West towards the end of the |
| astrology and chemistry. Many chemical works | | | | 16th century are found with end-papers brought |
| are ascribed to him. One of them is entitled | | | | from the East, but it was not until about a |
| Firdaus al-Hikmah fi'Ilm al-Kimiya. This work was in | | | | century later that European binders began to |
| verse, and contained 2,315 couplets. (6) An | | | | make them themselves. Hand-made marbled |
| encyclopaedic scientist, and philosopher, Abu Yusuf | | | | papers are now rarely used, but more or less |
| Ya'qub al-Kindi considered the art of | | | | clumsily reproduced imitations still serve various |
| transformation of one metal into the other as an | | | | purposes. |
| imposture. A few of 'his numerous works dealing | | | | There is an Arabic word 'rizma' meaning a bundle |
| with many sciences are extant. One of his works | | | | of merchandise, which had been adopted in |
| is on pharmacy, a branch of applied chemistry. (7) | | | | almost every Western language with slight |
| Chemistry was usually mixed up with mineralogy | | | | variations to mean a bundle of paper (English: |
| and geology. The oldest Arabian lapidary which | | | | ream). This also testifies to the Arabic origin of |
| may serve as an important source of chemistry | | | | that business in the West. (22) Tiles : The industry |
| was written by 'Utärid Ibn | | | | of tile-making which involves a large number of |
| Muhammad al-Hãsib who flourished in | | | | complex technical and chemical processes, was |
| the ninth century. It deals with the properties of | | | | highly developed by Arabs. The earliest treatise, a |
| precious stones. (8) In the same century | | | | Persian text, dealing with the manufacture of |
| Jãbir's work was further advanced | | | | faience, was unique of its kind in world literature |
| by al-Räzi who wrote many chemical | | | | until the 16th century. It has been written by 'Abd |
| treatises, and described a number of chemical | | | | Allah Ibn 'Ali Kà shà ni in the 13th |
| instruments. One of his treatises consists of 25 | | | | century. This book entitled Jawahir |
| pieces of chemical apparatus. He made | | | | al-'Arã'is Wa Aja'ib |
| investigations on specific gravity. One of his | | | | al-Nafä'is was written on precious |
| important works is on the art of transformation | | | | stones and perfumes. It explains the manufacture |
| of baser metals into the noble ones. He applied his | | | | of Faience, the ingredients (as clay, borax, |
| chemical knowledge for medical purposes, thus | | | | feldspar, cobalt, lapis lazuli, lead, manganese, tin |
| laying the foundation of Iatrochemistry. (9) Other | | | | etc.), their mixtures, the kiln processes and |
| important chemists of this century were | | | | implements, the methods of glazing and |
| Dhu'l-Nün and al-Jà hiz. The | | | | decorating. This treatise is similar to the various |
| former mostly dealt with the art of transmutation | | | | other treatises on precious stones written in |
| of metals. (10) The latter prepared ammonia from | | | | Arabic and Persian. The final chapter deals with |
| animal offals by dry distillation. (11) In the tenth | | | | the art of enamelled pottery. This account is |
| century Ibn Wahshiyah wrote on chemistry, His | | | | specially valuable because it is based on actual and |
| work may help to understand chemical symbolism. | | | | traditional practice. The maker of the beautiful |
| Maslamah Ibn Ahmad, an astronomer, | | | | lustre 'mihrab' (arch) of the tomb of Imam |
| mathematician and oculist of this century wrote | | | | Yahyã (now in the Hermitage, |
| two chemical works entitled, Rutbat al-Hakim and | | | | Leningrad), dated 1305 A.C., Yusuf Ibn 'Ali Ibn |
| Ghãyat al-Hakim. The second is well | | | | Muhammad, was possibly a brother of the author. |
| known in the Latin translation made in 1252 by | | | | (23) Ceramics: The early history of Arabian and |
| the order of King Alfonso under the title Picatrix. | | | | Egyptian ceramics has not so far been written. |
| (12) A Persian pharmacologist Abü | | | | Many interesting specimens have been discovered |
| Mansür Muwaffaq Ibn 'Ali al-Harawi | | | | in recent years which throw much light on the |
| who flourished in Herat in the tenth century, was | | | | development of this industry in the Arab world. |
| apparently the first to think of compiling a treatise | | | | The centers of this industry were situated in |
| on Materia Medica in Persian. He travelled | | | | Persia, Mesopotamia, Syria, Egypt and Valencia |
| extensively in Persia and India to obtain necessary | | | | from where various types spread rapidly |
| information. He wrote, between 968 and 977, a | | | | throughout the Islamic Caliphate. Under Arabian |
| book entitled Kitab al-Abniyah 'an | | | | influence the potters in these Centers revived old |
| Haqã'iq al-Adwiyah. It contains Greek, | | | | technical processes, developed new ones and |
| Syrian, Arabian, Persian, and Indian knowledge. It | | | | began to experiment with decorative and |
| deals with 585 remedies (of which 466 are | | | | ornamental schemes. The Arabian potters readily |
| derived from plants, 75 from minerals, and 44 | | | | absorbed progressive ideas but at the same time |
| from animals). He classified them into four groups | | | | maintained great originality. Two types of pottery |
| according to their action, and gave the outline of a | | | | were in common use; enamelled and lustered. In |
| general pharmacological theory. Abu | | | | enamelled pottery (the glazed earthenware) the |
| Mansür distinguished between | | | | Ancient s, from an early period, were expert |
| sodium carbonate (natrum) and potassium | | | | masters. In lustered pottery also they made |
| carbonate (qali). He had some knowledge of | | | | great progress. "In this the design is painted in a |
| arsenious oxide, cupric oxide, silicic acid, antimony | | | | metallic salt on a glazed surface and fixed by firing |
| and so on. He knew the toxicological effects of | | | | in smike in a way that gives it a metallic gleam, |
| copper and lead compounds, the depilatory virtue | | | | which varies in different specimens from a bright |
| of quicklime, the composition of plaster of Paris | | | | copper-red to a greenish- yellow tint, and in some |
| and its surgical use. (13) The greatest Arabian | | | | cases throws off brilliant iridescent reflections. (24) |
| surgeon, Khalaf Ibn 'Abbäs | | | | In the last chapter of the Persian text Kitab |
| al-Zahrãwi (d. 1013) wrote a great | | | | al-Jawähir' al-'Ara'is Wa |
| medical encyclopaedia, al-Tasrif in 30 sections, | | | | 'Ajã'ib al-Nafa'is, the author describes |
| which contains interesting methods of preparing | | | | the techniques of glazing with two fires (lustres), |
| drugs by sublimation and distillation, but its most | | | | leaf building, over glaze decoration fired in a muffle |
| important part is the surgical one. (14) | | | | kiln. (i.e., separated from the flame, the source of |
| Abü Rayhan Muhammad | | | | heat being outside), haf't rang, a Persian term |
| al-Birüni (973-1048) took a great | | | | referring to the seven colours of the planets. |
| interest in the determination of the specific | | | | There may be a reference to the polychrome |
| gravity of eighteen precious stones and metals. A | | | | over glaze technique, the so called minai ware |
| voluminous unedited lapidary by al- Biruni is extant | | | | (another Persian term; mina-wash means lustre; |
| in unique manuscript in the Escorial Library. It | | | | mina coloured). The author indicates differences |
| contains a description of a great number of | | | | between the art as practiced in Kashan, Baghdad |
| stones and metals from the natural, commercial, | | | | and Tabriz. In Baghdad and Tabriz other kinds of |
| and medical point of view. Moreover, he | | | | firewood and potash were used. In the 15th |
| composed a pharmacology (saydalah).Important | | | | century the Arabian ceramic art was followed by |
| information could certainly be obtained from his | | | | Italian potters, who obtained much of the mature |
| unedited works, on the origin of Indian and | | | | technical knowledge from Arab sources. This |
| Chinese stones and drugs, which appeared in early | | | | technical knowledge proved to be helpful in the |
| Arabic scientific works. (15) Ibn Sinà wrote | | | | revival of ceramic art during the Renaissance. (25) |
| a treatise on minerals, which was very important | | | | REFERENCES :- 1. Encyclopaedia Britannica, |
| and one of the main sources of geological | | | | chicago, 1951, p.360 2. Ibid., p. 355. 3 Sarton |
| knowledge, also a source of chemistry in Western | | | | George, Introduction to the History of Science, |
| Europe until the Renaissance. As mentioned | | | | Washington, 1950, Vol I. p. 532. 4. Wasiti, Hakim |
| before, mineralogy stood in close relation to | | | | Nayyar, Tibb al-'Arab ( ãn Urdu |
| chemistry. Nearly fifty Arabic lapidaries have been | | | | Translation of Arabian Medicine by Edward G. |
| named. The best known of them is. the 'Flowers | | | | Browne), Lahore, 1954, p. 26. 5. Ibid. 6. |
| of Knowledge of Stones', by Shihà b al-Din | | | | Hãji Khalifah, Kashf |
| al-Tifãshi (died in Cairo in 1154). It | | | | al-Zunün, Istanbul, 1943. Vol., I, p. |
| gives in 25 chapters extensive information on the | | | | 1254. Al-Zirakli, Khair al-Din, Al-'Alãm |
| subject of the same number of precious stones, | | | | vol. II p. 342. 7. Sarton, op. cit., p. 559. 8. Ibid., p. |
| their origin, geography, examination, purity, price, | | | | 572. Al-Qifti, op. cit. p. 251. 9. Ibid., p. 271. Sarton, |
| application for medicinal and magical purposes, and | | | | op. cit. p. 609. 10. lbid, p. 592. 11. lbid, p. 597. 12. |
| so on. Except for Pliny and the superior | | | | Ibid., pp. 620, 668. 13. Ibid., p. 678. 14. Ibid., p. 681. |
| Aristotelian lapidary, he quotes only Arabic | | | | 15 Ibid., p. 707. 16. Ibid, vol. II, part II, p. 650. |
| authors. (16) | | | | 17. Ibn Khaldun, Muqaddimah, English translation by |
| The output of the books on Chemistry was very | | | | Frenz Rosenthal, London, 1957, vol. 3, p. 267. 18. |
| great after the eleventh century. Thus, there are | | | | Ibid. p. 278 19. Haji. Khalifah, op. cit. p. 1936. 20. |
| known books of about forty Arabic and Persian | | | | Sarton, op. cit vol. III, part I, p. 759. 21. Ibid. Vol. II, |
| chemists. Ibn Khaldun, (d. 1406) the talented | | | | Part. II, p. 1045. 22. Sarton, op. cit., Vol. III, Part I, |
| Arabian philosopher of history and the greatest | | | | p. 321. 23. Sarton, op. cit vol. III , part I, p. 756. 24. |
| intellect of his century, was a violent opponent of | | | | Arnold and Guillaume, op. cit. p. 125. 25. Sarton, |
| the idea of transmutation of metals by chemical | | | | George, Introduction to the History of Science, |
| means. (17) Some chemists thought that one | | | | Carneige Institution of Washington, 1951, Vol. I, p. |
| metal can be transformed into another by artificial | | | | 632. |
| methods. For such transformation they followed | | | | |