MUSEUM OF COMPAKATIVE ZOOLOGY. 11 



on a problem in variation till the middle of the year, when he ac- 

 cepted a temporary position in Williams College caused by the 

 death of Professor Peck ; Mr. W. L. Tower studied variation in 

 the color-pattern of the wings of certain beetles. 



Dr. Parker supervised the work of the following men in Zoology 

 20a : Mr. C. W. Prentiss continued his studies on the otocyst of 

 decapod Crustacea, and Mr. S. R. Williams his on the changes 

 accompanying the migration of the eye in flounders ; Mr. F. 

 Howe, Jr. investigated the early condition of the nervous system 

 in the spider and the lobster ; Mr. P. Frandsen began work on 

 planarians ; Mr. R. M. Yerkes began the study of the pineal eye 

 of a reptile ; Mr. P. E. Sargent continued his researches on the 

 central nervous system of teleosts, arriving at some interesting 

 results, which have been published as No. 106 of the Contribu- 

 tions ; Mr. W. A. Hickman continued work on the mesenteries of 

 Amphibia. The studies of Mr. W. A. Willard on the eyes of 

 Pecten were supervised by Doctors Parker and Castle jointly. 



Dr. Castle had entire charge of the following men in their 

 researches : Mr. H. W. Rand continued his studies on the centro- 

 somes of nerve cells in the earthworm, and Mr. R. W. Hall on 

 the mesonephros in Amphibia; Mr. M. A. Bigelow nearly com- 

 pleted a valuable paper on the development of Lepas ; and Mr. J. 

 C. Phillips studied the development of the ear in Amblystoma. 



In June, 1899, the degree of Doctor of Science was conferred 

 upon one candidate in zoology, Mr. Justus Watson Folsom. His 

 thesis consisted of two parts: I. The Anatomy and Physiology of 

 the Mouth-Parts of the Collembolan, Orchesella cincta L. ; II. The 

 Development of the Mouth-Parts of Anurida rnaritima Guer. Dr. 

 Folsom was appointed at the close of the year to the Chair of 

 Biology in Antioch College. The degree of A.M. was conferred 

 upon five students whose work had been chiefly zoological, and 

 that of S.M. upon one. 



Professor Jackson published a paper on development of animals 

 and plants, the title of which will be found in the Report on 

 Geology. Dr. Davenport published during the year " Experimen- 

 tal Morphology, Part Second. Effect of Chemical and Physical 

 Agents upon Growth," — " The Fauna and Flora about Cold Spring 

 Harbor, L. I.," — " Statistical Methods with Special Reference to 

 Biological Variation," and articles in The American Naturalist. 

 He continued to be Director of the Biological Laboratory of the 



