12 



ANNUAL REPORT OF THE 



organs of two remotely related crustaceans being substituted for 

 one of the histological exercises. The chief assistant in the course 

 was Mr. G. T. Hargitt, and the sub-assistants were Messrs. J. W. 

 Mavor, A. P. Romine, and P. H. Timberlake. The assistant in 

 charge of the laboratory work of the Radcliffe course was Mr. 

 S. C. Palmer. 



Zoology 2 was given by Professor Castle, who had as chief assis- 

 tant Mr. J. Detlefsen, and as sub-assistant Mr. S. C. Palmer. 



In Zoology 3, conducted by Dr. Rand, the work of the first half- 

 year was successfully completed by one student not appearing in 

 the summary of Table I, and the lectures were attended by yet 

 another person. The chief assistant in the course was Mr. E. A. 

 Boyden, the sub-assistant, Mr. J. W. Mavor. There was no assis- 

 tant in the Radcliffe course. 



The laboratory exercises in Zoology 4 were under the general 

 supervision of Dr. Rand, but Mr. E. D. Congdon had immediate 

 charge of the work. The lectures, by Professor Mark, and the 

 laboratory work were substantially the same as in former years. 

 Mr. Congdon also had charge of the laboratory work in the 

 Radcliffe course. 



The laboratory work in Zoology 5a covered, in addition to a 

 study of the ovary and ovogenesis of a mammal as in former years, 

 a histological study of the testis of the white rat, and of certain 

 stages in spermatogenesis. The lectures were by Professor Mark, 

 and the laboratory work was in charge of Mr. E. D. Congdon under 

 the genera] supervision of Dr. Rand. Mr. Congdon also had charge 

 of the Radcliffe laboratory. 



The lectures in Zoology 7a and Zoology 7b were given by Pro- 

 fessor Wheeler at the Museum of Comparative Zoology in Cam- 

 bridge; the laboratory and field exercises were conducted at the 

 Bussey Institution, Jamaica Plain. In the latter work Professor 

 Wheeler had the assistance of Mr. Hayhurst. 



Professor Jackson gave Zoology 8 and Zoology 9a, the latter 

 with the aid of an assistant, Mr. F. H. Lahee. The present equip- 

 ment for instruction in Palaeontology is described on p. 22. 



The plan of assigning individual problems as the laboratory 

 work of Zoology 1 1 was abandoned by Professor Castle on account 

 of the increased enrollment in the course. For this, demonstrations, 

 problems, and the study of prepared material in common were sub- 

 stituted, written reports being required from time to time. 



