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also expressed the opinion that the Glacier theory would account 

 for this phenomenon as well as any that has yet been suggested ; 

 and pointed out, on a map of the glaciers of the Alps, similar 

 trains of boulders parallel to the course of the glaciers. 



The President exhibited a Cast, lately procured from 

 England, of the lower jaw of Mastodon elephantoides , the 

 original of which was brought from India by Dr. Falconer. 



Dr. Shurtleff announced the donation from Dr. W. R. 

 Lawrence, of a series of foetal Skeletons. Thanks were 

 voted to Dr. Lawrence for this donation. Also the acquisi- 

 tion of the Skeleton of a Bison, and a Moose, for the latter 

 of which, the Society was indebted to their President. 



Dr. Abbot gave an account of the Singing Mouse, which 

 he had recently seen in Philadelphia. 



This mouse was captured a few months since in an apartment 

 where Canary birds were kept. Its note resembles very much 

 the sounds produced by a whistle made of quill, when blown with 

 its extremity in a vessel of water. It seems to be as near an im- 

 itation of that of a Canary bird, as its organs are capable of. It 

 consists of a succession of very rapid trills, interrupted at inter- 

 vals by a few mellow warbling notes, with rests between ; and 

 sometimes a few notes like the mild chirp of the American robin 

 while unmolested in the vicinity of its young. Sometimes it is a 

 rapid repetition of two notes with a musical interval of a second 

 between ; very much like the mocking bird's imitation of the 

 creaking of a wheelbarrow. The sound is kept up for hours 

 together without intermission, and although perfectly voluntary, 

 it does not interrupt the animal's occupations, not even feeding. 

 It is produced equally during inspiration and expiration ; it is 

 very difficult to detect any difference in its character correspond- 

 ing to the different direction of the air. It is thought by the 

 owner of the animal that the sound comes from the nose. Dur- 

 ing the time Dr. Abbot heard it, it was constantly gnawing the 

 wires of its cage, producing a loud noise not in the least inter- 

 fering with its music, which was kept up incessantly during the 

 half hour he was examining it. Its movements are so rapid, 

 constantly climbing on the wires of its cage, and gnawing them, 



