14 ANNUAL REPORT OF THE 



the preceding year, by Professor Castle and Assistant Professor 

 East. On the zoological side the laboratory work was conducted 

 partly at the Bussey Institution and partly at the Museum of 

 Comparative Zoology. Mr. C. C. Little assisted in the course. 



Zoology 12 was given by Professor Mark, whose assistant in the 

 laboratory work was Mr. S. I. Kornhauser. 



In Zoology 146, by Professor Parker, four students substituted 

 theses for the laboratory work. Of those who chose laboratory 

 work, two had the same topics as in Zoology 20c. The results 

 reached by two others will be prepared for publication. Two 

 students not enrolled attended the lectures. 



The laboratory work of Assistant Professor Rand's course 

 Zoology 17 consisted in regeneration and grafting experiments 

 on Hydra. The lectures were attended by two graduates who 

 were not enrolled. 



Nineteen students (fourteen registered in the Graduate School 

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

 Science, and one Senior) carried on researches, five each under 

 Professors Mark and Parker, and three each under Professors 

 Wheeler, Castle, and Rand. 



Of these, four met the requirements for, and received in June, 

 the doctor's degree, three — Messrs. Barbour, Day and Laurens — 

 receiving the degree Ph.D., and one — Mr. Titus — the degree 

 S. D. The thesis of Thomas Barbour was entitled "A contribution 

 to the zoogeography of the East Indian Islands," that of Edward C. 

 Day, " The effect of colored light on pigment migration in the eye of 

 the crayfish" that of Henry Laurens, " The reactions of amphibians 

 to monochromatic lights of equal intensity ," and that of Edward G. 

 Titus, " Monograph of the genera Phytonomus and Hypera." Mr. 

 Samuel C. Palmer completed the requirements for the degree 

 Ph. D., but too late for recommendation in June. His thesis is 

 entitled " The numerical relations of the histological elements in the 

 vertebrate retina." The thesis of Mr. J. W. Chapman, on " Insects 

 injurious to the trees in the college yard," was accepted and will be 

 published soon. Satisfactory work was accomplished by the 

 other research students. 



Two students received aid from the income of the Humboldt 

 Fund to the amount of $138.57 while working at the Bermuda 

 Biological Station, and one while working at Woods Hole received 

 from the same source $58.00. 



The Bermuda Biological Station was opened June 26, and closed 

 August 5. Of the four persons enrolled, three were connected with 



