following list the date of publication given is that of the first edition. His most important philosophical work is Quaestionum peripateticarum libri V (1569). Cesalpino proves himself in this to be one of the most eminent and original students of Aristotle in the 16th century. His writings, however, show traces of the influence of Averroes, hence he is an Averroistic Aristotelean; apparently he was also inclined to pantheism, consequently he was included, later, in the Spinozists before Spinoza. A Protestant opponent of Aristotelian views, Nicolaus Taurellus wrote several times against Cesalpino. The work of Taurellus entitled Alpes cæsae, etc. (1597), is entirely devoted to combating the opinions of Cesalpino, as the play on the name Cæsalpinus shows. Nearly one hundred years later Cesalpino's views were again attacked by Samuel Parker, in a work entitled Disputationes de Deo et providentia divina (1678). Cesalpino repeatedly asserted the steadfastness of his Catholic principles and his readiness to acknowledge the falsity of any philosophical opinions expounded by him as Aristotelean doctrine, which should be contrary to revelation. In Italy he was in high favour both with the secular and spiritual rulers. Medical and physiological works Cesalpino's physiological investigations concerning the circulation of the blood are well known, but even up to the present time they have been as often overestimated as undervalued. An examination of the various passages in his writings which bear upon the question shows that although it must be said that Cesalpino had penetrated further into the secret of circulation of the blood than any other physiologist before William Harvey, still he had not attained a thorough knowledge, founded on anatomical research, of the entire course of the blood. Besides the work Quæstionum peripateticarum already mentioned, reference should be made to Quaestionum medicarum libri duo (1593). Botanical works His most important publication was De plantis libri XVI (1583). The date of its publication, 1583, is one of the most important in the history of botany before Carl Linnaeus. The work is dedicated to the Grand Duke Francesco I de' Medici. Unlike the "herbals" of that period, it contains no illustrations. The first section, including thirty pages of the work, is the part of most importance for botany in general. From the beginning of the 17th century up to the present day botanists have agreed in the opinion that Cesalpino in this work, in which he took Aristotle for his guide, laid