MUSEUM OF COMPARATIVE ZOOLOGY. 13 



The laboratory work in Zoology 17 consisted in experimental 

 investigations of regeneration in planarians. The course was con- 

 ducted by Assistant Professor Rand. 



The RadclirTe courses in Zoology 1 and Zoology 2 were conducted, 

 both lectures and laboratory work, by Mr. D. W. Davis, who also 

 assisted Professor Rand in the laboratory work of Zoology 4 in 

 Radcliffe. 



Professor KiikenthaPs course on "Certain Aspects of the Com- 

 parative Morphology of Vertebrates" — Zoology 19 — was at- 

 tended regularly by six students, three of whom were enrolled in 

 the course. Some of the instructors in the department were also 

 more or less regular attendants at his lectures, which covered a 

 large range of interesting topics. 



Nineteen students (nine registered in the Graduate School of 

 Arts and Sciences, and ten in the Graduate School of Applied 

 Science) were enrolled in courses of research, four each under super- 

 vision of Professors Mark and Parker, five each under Professors 

 Wheeler and Castle, and one under Assistant Professor Rand. 



Three of these, named below, completed the requirements for 

 the degree of Doctor of Philosophy, which was conferred on them 

 in June. The thesis of Alfred O. Gross was entitled: The reac- 

 tions of arthropods to monochromatic lights of equal intensities, 

 and that of Sidney I. Kornhauser: A comparative study of the 

 chromosomes in the spermatogenesis of Enchenopa binotata (Say) 

 and Enchenopa (Campy ienchia Stal) curvata (Fabr.). The thesis 

 of Donald W. Davis, entitled, Asexual multiplication and regener- 

 ation in Sagartia luciae Verrill, was approved, and Mr. Davis 

 will come up later for his final examination. Mr. Samuel C. 

 Palmer, whose thesis was mentioned in the last report, received 

 the degree of Ph. D. at mid-year. 



Three students were granted aid from the income of the Hum- 

 boldt Fund to the amount of $205.71 while carrying on work at 

 the Bermuda Biological Station, and two to the amount of $61.71 

 while working at Woods Hole. 



The Bermuda Biological Station was open from June 24 till 

 August 10. Of the four persons enrolled, three were connected 

 with Harvard University. 



In November Professor Kiikenthal presented before the National 

 Academy of Science, as guest at its meeting in New York City, a 

 paper subsequently published as Contribution No. 230 from the 

 Zoological Laboratory. 



In March Professor Parker read by invitation a paper entitled 



