8 ANNUAL REPORT OF THE 



of occasionally on that day, in addition to the Tuesday and Thurs- 

 day lectures. The laboratory work was revised, and a new outline 

 printed. By change in the laboratory hours the student is now 

 required to do the laboratory work of each week on three consecu- 

 tive hours, or, at least, without other interruption than that 

 necessitated by attendance on the lectures of the course. This 

 regulation has made the supervision of the laboratory work more 

 methodical and efficient than when students were allowed to sepa- 

 rate the hours of attendance, and it is not known to have obliged 

 any student to give up the course. Professor Parker had as Chief 

 Assistant, Mr. R. S. Breed, and as Sub-Assistants, Messrs. H. S. 

 Davis, J. M. Johnson, and T. Ordway. The course was taken as 

 an " extra " by four students not enumerated in the table. 



The laboratory work in Zoology 2 embraces the dissection and 

 study of some ten or twelve types of animals, and varies some- 

 what from year to year, according to the selection of forms made 

 for work in Zoology 1. The course was given substantially as in 

 former years. Dr. Castle had as Chief Assistant, Mr. H. Crawley. 

 Mr. W. P. Hager was Sub-Assistant during about three-fourths of 

 the course, and Mr. G. M. Allen during one-fourth. Owing to the 

 fact that none of the assistants had had previous experience in 

 assisting in this course, the instructor was compelled to devote 

 more time than he ordinarily does to personal supervision of the 

 laboratory work. 



The work in Zoology 4 was carried on as in former years. The 

 laboratory was in charge of Dr. Rand, who also gave five lectures 

 on the anatomy of Glossiphonia, — the animal used in studying 

 various matters of technique. The remaining lectures of tins 

 course and those in Zoology 5 were given by Professor Mark. In 

 the latter course Dr. Rand had charge of the laboratory work. 



The courses in Experimental Morphology were resumed, Dr. 

 Castle, who is to give both these courses, having begun with 

 Zoology 10, Ontogenesis. In the lectures were discussed the physi- 

 cal and chemical peculiarities of living substance, and the effect 

 upon it and its activities of various agents, such as chemical agents, 

 heat, light, gravity, etc. The special topic of sex in animals and 

 plants was also discussed at some length. Among the special 

 topics for experimental work assigned to students were : acclimati- 

 zation to high temperatures ; the effects of increased and diminished 

 atmospheric pressure ; the effect of close breeding in the case of 



