MUSEUM OF COMPARATIVE ZOOLOGY. i) 
ate took the work for the first half-year without being enrolled ;. 
on the other hand three of those enrolled were dropped before the 
end of the year. The plan of devoting occcasionally a lecture 
hour to aconference on previous work, instead of a formal lecture, 
resulted in giving to some of the poorer students an increased in- 
terest in the work, and is thought by the instructor, Dr. Rand, 
to be worthy of further trial. A new edition of the Outline of 
the Laboratory Work in this course was prepared by Dr. Rand 
and published by the Harvard Codperative Society. This outline 
on the Comparative Anatomy of Vertebrates, originally pre 
pared by Professor Parker, has been revised and considerably 
amplified by Dr. Rand in the new edition. The assistant in this 
course was Mr. I. A. Field. 
Zoslogy 4 and 5 were given substantially as in the preceding 
year, Dr. Rand having charge of the laboratory work and giving 
in Course 4 a few of the lectures on the anatomy and histology 
of the Hirudinea. 
Zoblogy 8 and 9 were given by Professor Jackson. Several 
specimens useful for students in Palaeozodlogy were purchased 
from Ward’s Natural Science Establishment, and others were re- 
ceived from students in the Department. 
Six of the eleven students enrolled in Zodlogy 10, under Pro- 
fessor Castle, were allowed to take the lectures without laboratory 
work, and to count this as a half-course. The remaining five 
were occupied with the investigation of special problems, mainly 
questions of inheritance, and the results of their studies will be 
presented later for publication. Two of the five met the labora- 
tory requirements of this course by giving additional time to the 
work selected for investigation in Zodlogy 20. Contribution 164 
was based on work done in part in connection with this course in 
a previous year. | 
In Zodlogy 18, by Professor Parker, both lectures and labora- 
tory exercises were substantially the same as in 1903-04; but in 
Zodlogy 16 the lectures were thoroughly revised. The laboratory 
work in Course 16 consisted, as heretofore, of separate research 
topics. In four cases these were identical with the topics of the 
same students in Zodlogy 20. In some of the other seven cases 
the results reached are to be presented for publication. Contri- 
butions from the Zodlogical Laboratory numbered 161 and 162 
represent work done in this course or its companion course (Zodl- 
ogy 15), and 1638 is based on experiments conducted under the 
