i89S-] 509 [Annual Meeting. 
1. April 13. The work done by the ocean. 
2. April 20. The work done by rivers and glaciers. 
3. April 27. The work done by atmospheric and organic 
agencies. 
4. May 4. The work done by igneous agencies. 
Following these will be lectures on various branches of zoology. 
These lectures are especially designed to explain the collec- 
tions in the museum, and after every lecture some time will be 
spent in the examination of the specimens. Thus teachers 
intending to make use of these collections in their work will have 
an opportunity to become acquainted with them. A great 
advantage over preAdous methods of instruction lies in the fact 
that visitors will have a series of lectures covering progressively 
the principal portions of the collections." 
Dynamical Zoology. 
The Curator has expended considerable time upon the genus 
Achatinella in working up and describing the species and in 
trpng to obtain suitable materials to fill gaps in the series. 
Geology. 
During the summer and fall Prof. W. O. Crosb}^ devoted much 
time to field Avork in the Blue Hill area. Early in the season, 
and in a part of the Hills not previously examined in detail, he 
found an important clue to the relations of the granites and the 
felsites. This discovery indicates, in general terms, that the hills 
are laccolitic or batholitic masses of granite in the midst of the 
Cambrian slate. The felsites occur chiefiy as a contact zone 
betAveen the granite and slate, and partly as great dikes and 
sm-face floAvs. The chief object of tlie field work has been to 
test this ncAv idea and to determine the outlines of the A^arious 
batholites. 
Feeling the great importance of haA'ing the igneous rocks of 
this area studied microscopically. Professor Crosby made an 
arrangement with Mr. Theo. G. White of Columbia college, 
New York City, to co-operate with him in this part of the Avork, 
