8 ANNUAL REPORT OF THE 



As for several years past, the laboratory work in Zoology 4, in 

 both Harvard and Radcliffe, was under the immediate charge of 

 Dr. Rand, who also gave five lectures on the anatomy and his- 

 tology of the Hirudinea. The remaining lectures given by Professor 

 Mark covered about the same ground as in the previous year, and 

 the material studied in the laboratory was Glossiphonia. 



In Zoology 5 the lectures, by Professor Mark, dealt chiefly 

 with selected problems, aud were supplemental to the reading re- 

 quired on the general outlines of Vertebrate Embrvoloszv. In the 

 laboratory less time than heretofore was given to the technical 

 part of the work, and more to the study of chick embryos and 

 preparations made from them. Dr. Rand had charge of the labo- 

 ratory work both in Harvard University and Radcliffe College. 



Professor Jackson's courses in Palaeontology (Zoology 9 and 9 a) 

 were larger than in the preceding year. Considerable addition was 

 made to the teaching material, chiefly from collections made at 

 the Bermuda Biological Station in the summer of 1903, by Messrs. 

 T. Barbour, 0. Bryant, and F. W. Carpenter. 



The lectures in Zoology 11, by Professor Castle, were largely re- 

 written, and their preparation occupied a considerable portion of 

 the instructor's time. Each of the eight students to whom was 

 assigned a topic for special study made satisfactory progress, 

 either in the accumulation of data, or otherwise, and the results 

 of their work will ultimately be incorporated in reports on the 

 various topics. 



The lectures and the laboratory work in Zoology 13 were 

 modified by reducing the amount of time given to nervous tissues, 

 and adding a consideration of cartilage and cuticula. The course 

 was thus made to include a study of representatives of all four 

 classes of tissues; it was given, as previously, by Professor 

 Parker. 



Zoology 15 was also given by Professor Parker, as usual. The 

 lectures were largely revised. The laboratory topics were in two 

 cases identical with those pursued in Zoology 20. The results 

 from studies on five of the eleven remaining topics will be pre- 

 sented for publication later. 



There were enrolled in the course on Cytology, by Dr. Petrunke- 

 vitch, 9 students. Two lectures a week were given during the 

 second half-year, illustrated by an extensive series of microscopic 

 preparations and followed by informal discussions. There were 

 no examinations, and the course did not count toward the attain- 



