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In the "Historia Animalium" of Aristotle occurs his account of the blood vessels, which is by far the most elaborate met with in the literature until the writings of Galen. The Works of Aristotle, Oxford, Clarendon Press, Vol. IV, 1910, Bk. III, Chaps. II-IV, pp. 511b-515b.

In 1651, about two months before publication of Highmore's History of Generation, a work appeared which marks another period in seventeenth-century English embryology. William Harvey, De Motu Cordis almost a quarter of a century behind him, now published De Generatione Animalium, the work he said was calculated "to throw still greater light upon natural philosophy."

Marcus Varro, in his satire inscribed The Testament, alleging to this purpose the authority of Aristotle. Censorinus, lib. de die natali. Arist. lib. 7, cap. 3 & 4, de natura animalium. Gellius, lib. 3, cap. 16.

L. Dittmeyer, Guilelmi Moerbekensis translatio commentationis Aristotelicae de generatione animalium, Dillingen, 1915. L. Dittmeyer, De animalibus historia, Leipzig, 1907.

Pythagoras, Alcmeon, Democritus, Diogenes of Apollonia, are all credited with anatomical and physiological investigations; and, though Aristotle is said to have belonged to an Asclepiad family, and not improbably owed his taste for anatomical and zoological inquiries to the teachings of his father, the physician Nicomachus, the "Historia Animalium," and the treatise "De Partibus Animalium," are as free from any allusion to medicine as if they had issued from a modern biological laboratory.

He was author of a long list of scientific essays, two of which only are responsible for his fame, viz., Theorice Medicaearum Planetarum, published in Florence, and the better known posthumous De Motu Animalium. The first of these two is an astronomical study in which Borelli gives evidence of an instinctive knowledge of gravitation, though no definite expression is given of this.

De Generatione Animalium, Oxford translation, Bk. II, Chap. 6, Works V, 743 a. In Vol. IV of Gomperz' "Greek Thinkers," you will find an admirable discussion on Aristotle as an investigator of nature, and those of you who wish to study his natural history works more closely may do so easily in the new translation which is in process of publication by the Clarendon Press, Oxford.

At Basle Clement found fresh materials, especially with respect to German and English anchorites; and he had even prepared a "Catena Eremitarum" from the year of our Lord 250, when Paul of Thebes commenced his ninety years of solitude, down to the year 1470. He called them Angelorum amici et animalium, i.e.

So far back as 1667 Abraham Mylius, in his treatise "De Animalium origine et migratione, populorum," argues that, since there are innumerable species of animals in America which do not exist elsewhere, they must have been made and placed there by the Deity: Buffon no less forcibly insists upon the difference between the Faunae of the old and new world.

'Where the love of man is, there also is love of the Art. Historia animalium, iii. 3, where it is ascribed to Polybus.