PROCEEDINGS ->/b 



OF THE , u j L I 8 H 



ACADEMY OF NATURAL SCIENCES ^X^ 



OF PHILADELPHIA. 



Vol. I. NOV. AND DEC. 1842. Nos. 20, 21. 



STATED MEETING, November 1, 1842. 

 Vice President Morton in the Chair. 



DONATIONS TO LIBRARY. 



Keport of the Secretary of the Navy in relation to the 

 second invention of Thomas S. Easton for preventing 

 explosions of steam-boilers. From Professor Johnson. 



Histoire Naturelle de l'.Ile de Cuba. Par M. Eamond de 

 la Sagra. Livs. 38 et 39. From a club of Members. 



WRITTEN COMMUNICATIONS. 



i 



A communication was read by the Recording Secretary 

 from Mr. Isaac Lea, dated October 31, 1842, correcting an 

 error committed by Mr. Haldeman in a communication 

 made by the latter to the Academy in May last, and pub- 

 lished in its Proceedings, in which he proposed that " the 

 letter u should take the place of w in the Unio Cowperiana 

 of Lea," on the ground of an error in the orthography. Mr. 



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