262 



that it was extremely difficult to fix the eye long enough on its 

 muzzle to ascertain precisely how the sounds were produced. 

 It could be seen, however, that there was a constant tremulous 

 motion of the upper lips and snout. On bringing the ear within 

 three inches of the animal while singing, it was very evident that 

 the interruptions between the notes and their various modulations 

 were produced as the sound issued from the vocal organs, rather 

 than in the throat. It usually begins its song at 9 or 10, P. M. 

 and continues it all night ; sometimes, when it is silent, striking 

 a few notes on the piano will set it to singing again. During the 

 day it sleeps most of the lime ; recently it has sung an hour or 

 two in the afternoon. It is fed on Canary seed and Indian meal. 

 Its appearance is in no way different from that of a common 

 mouse. 



Capt. Charles H. Matthews, of Sault St. Marie, and Capt. 

 Nathaniel E. Atwood, of Provincetown, Mass., were elected 

 Corresponding members. 



ADDITIONS TO THE LIBRARY. 



Proceedings of the Academy of Natural Sciences of Philadel- 

 phia. Vol. III. No. 10. July and August, 1847. From the 

 Academy. 



Annals and Magazine of Natural History. No. 133. October, 

 1847. 8vo. London. From the Courtis Fund. 



Proceedings of the American Academy of Arts and Sciences, 

 pp. 49 to 160. 8vo. pamph. Boston, 1847. From the Academy. 



Gray's Genera of Birds. Part 41. London, 1847. From the 

 Courtis Fund. 



Map of that part of the Mineral Lands adjacent to Lake Supe- 

 rior. Washington, 1847. From Hon. R. C. Winthrop. 



December \, 1847. 

 J. C. Warren, M. D., President, in the Chair. 



Dr. Gould stated, that among the Shells collected by 

 Dr. C. T. Jackson on the shores of Lake Superior, was a 

 npw snecies of Physa, which he exhibited and described ; 



