15 



REPORT ON THE INSTRUCTION IN BIOLOGY/ 



By Professors Farlow and Mark, Dr. D. D. Slade, and Mr. G. H. Parker. 



The courses of instruction in Zoology for the Academic year 

 1889-90 were the same as in the preceding year, and were car- 

 ried on by the same instructors. 



There were eighty students in Nat. Hist. 2 : one Graduate, ten 

 Seniors, eleven Juniors, nineteen Sophomores, twenty-six Fresh- 

 men, seven Specials, and six Scientific Students. For laboratory 

 work the class was, as usual, divided into sections. The Assist- 

 ants were Mr. C. B. Davenport and Mr. N. B. Potter. 



In Nat. Hist. 13 there were eight students. The lectures were 

 increased somewhat beyond those of the previous year, and with 

 the laboratory work embraced the anatomy and histology of 

 Hydra, Asteracanthion, Taenia, and Lumbricus. Mr. W. M. 

 Woodworth was assistant in the course. 



There were eight persons in Nat. Hist. 9, all but one of them 

 being Graduates. Early in the year Mr. Parker completed a 

 paper on " The Eyes in Blind Cray-fishes," and he has also made 

 considerable progress with his investigations on the comparative 

 histology and development of the compound eyes in Crustacea. 

 The plates illustrating an extended paper by Mr. C. B. Daven- 

 port on " Cristatella, the Origin and Development of the Indi- 

 vidual in the Colony," have already been completed by the 

 lithographer, and the text has been ready for the printer for 

 some time. Mr. W. E. Ritter has written a paper on "The 

 Parietal Eye in some Lizards from the Western United States," 

 and Mr. W. M. Woodworth has completed the first of his studies 

 on an interesting fresh-water Planarian, the title of his paper 

 being, " Contributions to the Morphology of Turbellaria. I. On 

 the Structure of Phagocata gracilis, Leidy." The engraving of 



* Professor Farlow's Report will hereafter appear with the Report of the 

 Botanical Department. 



