s 



Association of American Geologists and Naturalists. 131 



Afternoon, 4£ o'clock, P. M.—Dr. Charles G. P, o 



ed two new electro-magnetic instruments, of his invention, to pro- 

 duce a reciprocal motion. He calls it the axial reciprocating en- 

 gine. 



Dr. P. also made an oral communication on injecting the Lepi- 

 doptera with oxalic acid, to produce instant death without injury 

 to the plumage, by using a small glass tube drawn to a fine point, 

 piercing them under the thorax. He also recommended to de- 

 stroy the grease of the insect by the use of bibulous paper, touch- 

 ing the insect underneath, and in contact with the lining of the 

 cabinet case. 



Mr. Jarnpz Tfnll wmorU.1 ^ « „.,~~~^;i ; * 





tf- H. D. Rog 



Missou 



Waverley 

 th) annual report 



M his fifth report that it was the carboniferous. < 



ur.J. L. Smith made a communication on the existence of the 

 oxide of cobalt near Silver Bluff, South Carolina. The manner in 

 Mich the oxide occurs is on the surface of a coarse gravel, and 

 *as first made known to Dr. Smith by Prof. Ellet. The oxide is 

 ssociated with the oxide of manganese, and is free from arsenic. 

 e am »lysis of the mixture of the oxides does not give constant 

 result*, The result of one analysis was 35 per cent, of oxide of 

 c °Dau, and 65 per cent, of oxide of mar—- 



e aIso made a communication on the composition of iossil 



°jp' Some rem arks on the recent analyses of MM. Girardin 



reisser were made. The cause of the presence of fluorine in 



ese bones was particularly discussed, with a view to show that 



e above mentioned gentlemen were mistaken in their idea that 



onne was infiltrated in the bones after the death of the animal. 



e P ri ncipal argument was, that an analysis of two bones taken 



1 l " e same locality, eave less fluorine in those bones where it 



ev *iaent that most foreign matter had been infiltrated. 



th su!' ^ Iaur y^ u - S. Navy, read a paper on "the Currents of 

 e oea as connected with Geology," with a chart of the north 



his a,u,c °cean. Many of Lieut. M.'s remarks will be found in 

 'yneresting paper on the Gulf Stream at p. 161 of this No. 



: J' "' D> Rogers remarked on the importance of the sub- 

 Presented by Lieut. Maury, and suggested the appointment 



