In the later years of his life he turned to the study of the earlier phases of the science which he did so much to advance, and students of chemical history are greatly indebted to him for his book on Les Origines de l'alchimie (1885) and his Introduction a l'etude de la chimie des anciens et du moyen age (1889), as well as for publishing translations of various old Greek, Syriac and Arabic treatises on alchemy and chemistry (Collection des anciens alchimistes grecs, 1887-1888, and La Chimie au moyen age, 1893).
He translated the works of Bahya, Halevi, Saadiah and the grammatical treatises of Janah.
The extant treatises are as follows: (1) On the Sphere and Cylinder (Peri sphairos kai kylindron).
A Latin version of them was published by Isaac Barrow in 1675 (London, 4to); Nicolas Tartaglia published in Latin the treatises on Centres of Gravity, on the Quadrature of the Parabola, on the Measurement of the Circle, and on Floating Bodies, i.
A similar translation of Ecclesiastes, followed by treatises on the Karaites, on the Essenes and on the Kabbala, kept the author prominently before biblical students while he was preparing the first sections of his magnum opus, the critical study of the Massorah.
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