MUSEUM OF COMPARATIVE ZOOLOGY. 



41 



is not a suitable place in which to conduct many of the experi- 

 ments. 



Of the several topics investigated, two have been completed 

 ready for publication : (1) " On the Determination of the Direc- 

 tion and Rate of Movement of Organisms by Light. By C. B. 

 Davenport and W. B. Cannon." (2) Variation in the Markings 

 on the Thorax of Doryphora decemlineata, and their Experimental 

 Production. By W. L. Tower." A paper prepared by Dr. Dav- 

 enport last year, in conjunction with Mr. Neat, has been published 

 as No. LIII. of the Contributions. 



Next to a permanent laboratory, the most pressing need in con- 

 nection with this course is additional expensive apparatus for the 

 measurement of the intensity of the physical agents used in experi- 

 mental work. 



In accordance with the statement made in the last Report, 

 Zoology 7, by Dr. Parker, was so modified as to make the ground 

 covered in two successive years different. During the past year 

 the brief introduction to the study of the nervous system was 

 followed by an extended discussion of the Anatomy and Physiol- 

 ogy of Sense Organs. Laboratory work in connection with this 

 course is desirable, and it is hoped that provision for it can be 

 made as soon as the Department has at command the necessary 

 room. 



Following out the plan proposed in the Report of last year, 

 Zoology 6 and 7 have been enlarged, the former into two courses, 

 the latter into two half-courses. In both instances the work in 

 alternate years will be different, so that the change practically 

 amounts to offering to students one and a half additional courses 

 in Zoology. It has been decided to make in connection with this 

 change an alteration in the numbering of the courses involved, so 

 that for the present Zoology 6 and Zoology 7 disappear from the 

 annual announcement, and in their stead occur respectively the 

 courses numbered 10 and 11, and 15 and 16. 



The work of the students in Zoology 20a was highly creditable, 

 and as an outcome a considerable number of papers have been 

 well advanced or completed for publication. Some of these have 

 been preliminary notices, the nature of the subjects being such 

 that a prompt announcement of the chief results seemed desirable. 



The degree of Doctor of Philosophy was conferred at the last 

 Commencement upon two candidates in Zoology, Mr. Herbert S. 



6 



