MUSEUM OF COMPARATIVE ZOOLOGY. 11 



work in this course and in Hygiene 1 suggests the desirability of 

 correlation between the two courses with a view to avoiding 

 repetition on the part of students who take both courses. Several 

 anatomical preparations, made with the help of Mr. M. Reitz, 

 were added to the laboratory collection. 



The enrollment in Zoology 4 was rather larger than usual, and 

 the lectures were attended by two students not enrolled. The 

 course was conducted as in previous years, the laboratory work 

 being in charge of Dr. Rand. 



In the lectures in Zoology 6 most attention was given to the 

 development of the central nervous system. The laboratory was 

 in charge of Dr. Rand, who succeeded in covering thoroughly 

 more ground than during the first year in which the course was 

 given. Three graduate students not enrolled attended the lectures. 



Zoology 9a was given by Assistant Professor Jackson to five 

 Graduate students. Mr. F. H. Lahee assisted in the laboratory 

 work. By special permission one graduate student in Radcliffe 

 College was allowed to take the course. 



Students were allowed to take the lectures without the laboratory 

 work in Assistant Professor Castle's courses Zoology 11a and 116, 

 the two half-courses together counting under this arrangement as a 

 half-course. As shown in Table I, ten students availed themselves 

 of this privilege. Likewise one student in Radcliffe College was 

 allowed to attend the lectures under the same conditions. The 

 laboratory work in these two half courses consisted largely in 

 breeding experiments with small mammals, and certain of the 

 results will be incorporated in future publications. 



Zoology 13 was given by Professor Parker on the same general 

 lines as in 1905-06. The lectures were attended by two graduates 

 who were not enrolled. Professor Parker also gave, as in former 

 years, Zoology 15. The lectures were attended by three students 

 who were not enrolled and did no laboratory work. The course 

 was also repeated for three Radcliffe students. Of the laboratory 

 topics assigned three furnished results that are to be prepared for 

 publication. One Harvard student had as laboratory topic in 

 this course the same subject that he was at work upon in Zoology 

 20c under Professor Parker. 



Eleven graduate students were engaged in research, seven under 

 •direction of Professor Mark (Zoology 20a) , # three under Professor 



