10 ANNUAL REPORT OF THE 



tions (No. 177) from this laboratory ; that by another student is 

 nearly ready for publication, and that of a third is incorporated 

 with work done in Zoology 20 for a doctor's thesis. 



With the expansion of former Zoology 13 into two half courses 

 (13 and 14), given by Assistant Professor Parker, it is planned to 

 divide the field and to give the new courses in alternate years. 

 During the past year Zoology 13 has been given, the lectures 

 and laboratory exercises being limited to epithelial and nervous 

 tissues. 



Zoology 15, which alternates with 16, was given by Assistant 

 Professor Parker as in 1903-04, except for the revision of the 

 lectures. Five graduates besides those enrolled in the course, 

 attended the lectures. Of the nine topics assigned for investiga- 

 tion, four have yielded results for publication. 



Of the sixteen students enrolled in Zoology 20, eleven carried 

 on their work under the immediate supervision of Professor Mark, 

 three under Assistant Professor Parker, one under Assistant 

 Professor Castle, and one under Professor Mark and Assistant 

 Professor Parker, jointly. Two graduate students in Radcliffe 

 College also carried on special researches under Professor Mark. 



Besides the doctors' theses presented by five of these, papers 

 are completed or well advanced by most of the others. 



The degree of Doctor of Philosophy was conferred in June, 1906, 

 on the following students in Zoology, the title of the thesis immedi- 

 ately following the name in each case : Henry Bryant Bigelow : 

 Studies on the Nuclear Cycle of Gonionemus murbachii Mayer ; 

 Leon Jacob Cole : An Experimental Study of the Image- Forming 

 Powers of Various Types of Eyes; Arthur Day Howard: The 

 Visual Cells in Vertebrates, chiefly in Necturus maculosus ; John 

 Hancock McClellan : The Development of the Excretory System of 

 Amia calva; Hansford MacCurdy : The Influence of Selection on 

 Color Pattern in Guinea Pigs and Rats ; Samuel Ottmar Mast : 

 Light Reactions in Lower Organisms. I. Stentor coeruleus ; Her- 

 bert Eugene Walter: The Reactions of Planarians to Light. 



During the year Assistant Professor Parker published Contri- 

 butions Nos. 168, 169, 171, and 173. Assistant Professor Castle 

 . has published, besides Contributions Nos. 175-177, brief articles 

 and reviews in Science and in the American Naturalist. 



Two numbers of the Contributions from the Bermuda Biologi- 

 cal Station for Research have been published during the year : 



