14 ANNUAL REPORT OF THE 



same position the year before, and as Sub-Assistant Mr. W. L. 

 Tower. 



In Zoology 2 Dr. Castle gave the lectures and supervised the 

 laboratory work. His Chief Assistant was Mr. C. W. Prentiss, 

 who had been Assistant in the course during the previous year ; 

 the Sub-Assistant was Mr. W. A. Willard. 



Mr. W. B. Cannon conducted the work in Zoology 3 on the 

 same general plan that has been followed for several years. 

 Special topics in comparative anatomy were substituted for class 

 work during the last five weeks in the case of nine students, who 

 had done their routine w r ork in a manner to warrant this substitu- 

 tion. Mr. W. A. Willard was Assistant in the course. 



Zoology 4 and 5 were carried on substantially as in 1897-98. 



In addition to those regularly enrolled, Professor Jackson has 

 had, as more or less regular attendants on his lectures in Zoology 

 9, five students, mostly graduates. He proposes in future to 

 divide the course into two half courses, giving in the first half 

 year a more rapid survey of fossil invertebrates than heretofore, 

 and in the second half year more advanced work on selected 

 groups. It is hoped that the reduction of the time required for 

 the general survey will render it possible for a larger number of 

 the zoological students to take this important course. 



Zoology 15 was given by Professor Parker in the second half 

 year ; not in the first as announced. The lectures were attended 

 regularly by one Instructor and one senior, in addition to those en- 

 rolled, and by three other students irregularly. Although proper 

 laboratory facilities could not be provided for this course, it was 

 decided to allow a certain number of men to substitute laboratory 

 work for the thesis required of other members of the class. Eight 

 students availed themselves of this opportunity to work on special 

 topics. The results obtained by three or four of them will be 

 presented for publication. In future the opportunity for labora- 

 tory work will be offered to a limited number of the students 

 electing this course or Zoology 16. Professor Parker also pro- 

 poses to transfer permanently Courses 15 and 16 to the second 

 half year, and to offer next year a half course in the first half 

 year, to be called Zoology 13, dealing with the structure and gen- 

 esis of the chief animal tissues, and giving special attention to the 

 structure and functions of the nervous elements in relation to 

 other tissue elements. 



