22 ANNUAL REPORT OF THE 



Spirostomum and Stentor, Grantia, Metridium, Asterias, Nereis, 

 Cambarus, Periplaneta, Helix, and Rana. Each student was re- 

 quired, as usual, to give six hours per week to laboratory work. 

 There were regularly two lectures per week (Mondays and 

 Wednesdays), and occasionally an additional lecture on Friday. 



Mr. F. C. Waite was Assistant in the course, and is commended 

 by Dr. Castle for his zeal and industry. Mr. H. G. Barber also 

 assisted in the laboratory work to relieve Dr. Castle during hours 

 when his engagements in another course required his presence 

 elsewhere. 



The only change made by Dr. Parker in conducting the work of 

 Zoology 3 was to limit the permission to substitute topic work for 

 the regular work during the last seven weeks of the course to those 

 students whose work in the course had given evidence of their 

 being likely to profit by this opportunity. Six students were thus 

 permitted to omit the dissection of the pigeon and substitute for it 

 comparative work on selected topics. The results obtained by two 

 of these students may be later submitted for publication. Two 

 students not enrolled in the course attended the lectures. Two 

 Papers based upon work done in connection with this course in the 

 previous year have been published since my last report : they are 

 Nos. LXXXV. and LXXXVII. of the list of " Contributions " 

 accompanying the present report. 



It has been possible during the past few years to increase the 

 anatomical preparations useful in this course by the best of those 

 voluntarily made for that purpose by students in the course. 

 These, together with those which the Department " Diener " has 

 been able to make when not otherwise engaged, form a valuable 

 part of the material for the illustration of lectures, and it is the 

 purpose to increase this collection as rapidly as practicable. 



In Zoology 4 the lectures on bibliography, the microscope, micro- 

 tomes, and other matters of technique, were given as usual by Dr. 

 Mark. There were three lectures per week, and students spent 

 from six to ten hours per week in laboratory work, six hours being 

 the required minimum. The object selected for study this year 

 was the leech Clepsine. The laboratory work was conducted by 

 Dr. Castle, who also gave seven of the lectures in the course, his 

 subject being the anatomy and histology of Clepsine. 



Zoology 5 was conducted as in previous years, the laboratory 

 work being, however, under the direction of Dr. Castle. An ar- 



