Staler.] 
162 
[March 16 , 
Art. 2. The Library Committee shall have general direction of the 
expenditure of Library funds and appropriations, and make regulations for 
the use and care of the books. 
Art. 3. To be the former Art. 1 , and to read “ The Publishing Com- 
mittee shall,” etc. 
Art. 2. To be the former Art. 4. 
SECTION IX. OF MEETINGS. 
Article 1 . Change the word Custodian to Curator. 
Dr. W. G. Farlow gave an interesting account of the botany of 
the Bermudas, first sketching the character and geographical 
position of the group. 
The following paper was presented by title : 
ON THE RECENT ADVANCES AND RECESSIONS OF 
GLACIERS. 
BY N. S. SHALEK. 
It is a well known fact that all the carefully observed glaciers 
of the world show by the position of their terminal moraines, or 
other evidences, that they are subject to constant variations in the 
energy of the irflow. These variations have been a matter of 
considerable enquiry in Switzerland, where alone glaciers have 
been the objects of long continued study. Many physicists have 
endeavored to find some law of retreat and advance that is 
connected with the seasonal or cyclical variations of climate that oc- 
cur in that region. Having recently had occasion to go over these 
studies, I have been struck with the general neglect of certain 
very evident considerations concerning the laws of waste and sup- 
ply, that must determine the extension of these ice streams. A1 
though these considerations are of a very simple nature, it seems 
worth while to give them a formal statement. 
Nearly all the studies proceed on the assumption that the 
effect of changes in temperature and rainfall must be followed by 
a tolerably immediate and general change in the position of the 
terminal points occupied by the ice streams of this district, and 
