MUSEUM OF COMPARATIVE ZOOLOGY. 



13 



Zoology 14c and 14a 7 were conducted, as usual, by Professor 

 Parker. The lectures in the latter course were attended by three 

 graduates not enrolled in the course. Of the topics assigned 

 for laboratory work in that course, two gave results that will be 

 published. Two students worked upon the same subject in this 

 course and in Zoology 20c. 



The lectures in Zoology 17, by Dr. Rand, were attended by one 

 student not enrolled in the course. While the lectures pursued 

 in general the plan of Maas's book, "Einf tinning in die experi- 

 mentelle entwickelungsgeschichte," the subjects taken up were 

 treated more broadly than in the text book and were not limited 

 to those of the book. The special topics assigned for laboratory 

 work gave results that will be offered for publication. 



Eleven graduate students were engaged in research, six under 

 the direction of Professor Mark (Zoology 20a), one under Professor 

 Jackson (Zoology 206), two under Professor Parker (Zoology 20c), 

 and two under Professor Castle (Zoology 20c?). Of those enrolled 

 in Zoology 20a, two were students in Radcliffe College and will 

 continue their work the coming year; two presented theses for the 

 doctor's degree, and received the degree of Ph.D. The thesis of 

 E. D. Congdon was entitled "Studies of the effects of alpha, beta, 

 and gamma rays of radium upon the growth, structure, and pigment- 

 migration of animals," that of G. T. Hargitt "Maturation, fertili- 

 zation, and segmentation of Pennaria tiarella (Ayres) and of Tubu- 

 laria crocea (Ag.)." The thesis of J. A. Cushman, prepared under 

 Professor Jackson in course 206, was on " The phytogeny of the 

 mHioHdae." Mr. Cushman also received the degree of Ph.D. 



Three students received aid from the income of the Humboldt 

 Fund to the amount of $170. while working at the Bermuda Sta- 

 tion, and two received 865. while working at the Laboratory of 

 U. S. Bureau of Fisheries at Woods Hole. 



Professor Mark has received additional grants from the Carnegie 

 Institution of Washington to aid in his researches. He spent the 

 summer in visiting most of the biological stations of northern 

 Europe; and as delegate of the American Academy of Arts and 

 Sciences attended in June the Darwin celebration in Cambridge, 

 England. As guest of the University of Leipzig, he also attended, 

 at the end of July, the celebration of the five hundredth anni- 

 versary of the founding of that University. He was also received 



