FOURTH BULLETIN 



OF THE 



% 

 ^ 



^ 

 % 

 ^ 

 ^ 

 % 

 ^ 



NATIONAL INSTITUTE 



FOR THE 





PROMOTION OF SCIENCE, 



% 

 ^ 

 ^ 









WASHINGTON, D. C, 



February, 1845, to November, 1810. 



WASHINGTON: 



rUINTKD BY WILLIAM Q. . FORCE. 

 PENN, AVENUE, CORNER IOtH STREET. 



1846. 



% 

 % 



^ 







