104 MASSACHUSETTS AGRICULTURAL COLLEGE. 



gree of B.Sc. Between 1856 and 1863 he was associated with 

 Agassiz in the preparation of the anatomical and embryological 

 portions of the "Contribution to the Natural History of the United 

 States." In June, 1860 he was appointed adjunct Professor of 

 Zoology in Harvard University, which he held until the expiration 

 of his term of office in 1865. He gave a course of lectures on his- 

 tology at the Museum of Comparative Zoology, Cambridge, in 

 1861, and delivered a course of twelve lectures on "Mind in 

 Nature ; or the Origin of Life, and the Mode of Development of 

 Animals," at the Lowell Institute, Boston, in 1864. He was 

 appointed Professor of Botany, Zoology, and Geology, in the 

 Agricultural College of Pennsylvania, in December, 1<S66. Here 

 he remained until April, 1869, when he was appointed to the 

 chair of Natural History of the University of Kentucky. He 

 lived at Lexington, Kentucky, until February, 1872, when he was 

 elected Professor of Comparative Anatomy and Veterinary Sci- 

 ence in the Massachusetts Agricultural College. Busy with his 

 work at Amherst, and struggling with the fatal disease, tabes 

 mesenterica, he wasted away, and died on the 1st July, 1873, in 

 the forty-eighth year of his age. He was a member of most of 

 the learned societies in this country, while his works have been 

 recognized and referred to by the leading zoologists of Europe. 



In 1856 he was elected a fellow of the American Academy of 

 Arts and Sciences, and in 1870, an associate fellow of the same. 

 In 1857 he became a member of the Boston Society of Natural 

 History. In 1865 he was chosen a corresponding member of the 

 American Microscopical Society ; in 1866, corresponding member 

 of the Essex Institute, and in 1868, correspondent of the Phila- 

 delphia Academy of Natural Sciences. In 1872 he was elected a 

 member of the National Academy of Sciences, which, at that time, 

 was limited in membership to fifty of the foremost scientists of the 

 country. 



He married, 29th September, 1854, at Boston, Mary Young 

 Holbrook. Seven of their eight children are living, one daughter 

 having died in infancy. 



Mr. Clarke's first love for science seems to have grown from 

 his fondness for flowers. After he became a student of zoology 

 his love for botany remained undimiuished. "The influence of 

 his knowledge of botany on his zoological studies was marked. 

 It prepared him for his studies on spontaneous generation, on the 



