362 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
April 3, 1901. General meeting. Twelve persons present. 
Prof. J. E. Wolff. The extinct volcanoes of the Puv de Dome 
region and the Mt. Dore, Auvergne, France. 
April 17, 1901. General meeting. Twenty-five persons present. 
Mr. Robert M. Yerkes. Animal psychology: aims, methods, 
and present tendencies in the study of the mental life of 
animals. 
Publications. 
During the year the following publications have been issued: — 
The anatomy and development of Cassiopea xamachana. By 
Robert Payne Bigelow. Memoirs, vol. 5, no. 6, 46 pp., 8 pis., 12 
cuts. 
Description of the human spines showing numerical variation in 
the Warren Museum of the Harvard Medical School. By Thomas 
Dwight, M. D., LL. D. Memoirs, vol. 5, no. 7, 76 pp., 23 cuts. 
Proceedings of the annual meeting, May 2, 1900. Proceedings, 
vol. 29, no. 12, 18 pp. 
The embryonic history of imaginal discs in Melophagus ovinus 
L., together with an account of the earlier stages in the development 
of the insect. By II. S. Pratt, Ph.D. Proceedings, vol. 29, no. 13, 
32 pp., 7 pis., 5 cuts. 
Glacial erosion in France, Switzerland, and Norway. By William 
Morris Davis. Proceedings, vol. 29, no. 14, 50 pp., 3 pis., 7 cuts. 
Geology of the Boston Basin. Part III. — The Blue Hills Com- 
plex. By William O. Crosby. With supplementary chapters by 
A. W. Grabau. Occasional Papers, vol. 4, part 3, 406 pp., 24 pis., 
2 maps, 25 cuts. 
Library. 
The additions 
to the library 
r during the 
year have been : — 
8 vo. 
4to. 
Folio. 
Total. 
Volumes 
* 292 
62 
4 
358 
Parts 
1,914 
424 
2 
2,340 
Pamphlets 
399 
33 
10 
442 
Maps 
34 
34 
Total 
2605 
519 
50 
3174 
