November, 1841.] 127 



STATED MEETING, November 23d, 1841. 



Vice President Morton in the chair. 



donations to library. 



The American Phrenological Journal and Miscellany, 8vo. 

 Vols. 1, 2, and 3. From Nathan Allen, M. D. 



An Essay on the connection of Mental Philosophy with Medi- 

 cine. By Nathan Allen, M. D. 8vo. Philadelphia, 1841. 

 From the author. 



Boston Journal of Natural History. Vol. 2. Nos. 3 & 4. Boston, 

 1839. From the Society. 



Written Communications. Mr. S. S. Haldeman submitted 

 a note on a genus of Dolphins. He proposes the name 

 Hypodon for those dolphins which have two teeth in the lower 

 jaw, hitherto constituting the genus Diodon; which name, how- 

 ever, is preoccupied for a well known genus of fishes. The 

 name may be thought too much like Hyperodon ; but this is an 

 advantage, as the two are taken from similar characters ; 

 Hypodon meaning teeth below ; the other, teeth above. Ex- 

 amples, H. Desmarestii H. Sowerbyi. 



Verbal Communications. Prof. Johnson exhibited and ex- 

 plained his apparatus, illustrative of the laws of chemical 

 combination and of the combining volumes of gaseous sub- 

 stances. 



This apparatus consists of a series of cubical types, each of such 

 magnitude as to represent by its bulk in cubic inches the atomic 

 weight of one of the elementary bodies. Thus hydrogen is represent- 

 ed by a cube one inch on a side ; oxygen, by a cube of two inches 

 on a side, containing of course eight cubic inches ; iron by a cube 

 containing twenty-eight cubic inches, and so of the whole fifty-four 



