_ _ '■^^i'.''fe*^,iS*-i£'*S^ . 



rer and Wyman, and from Messrs. Hal- 

 number, — Also, a paper by Mr. W '' 

 Iessia7i Fly, by Mr. E. C. Herm 

 Rr authors, must be fully given, 

 (should always specify at the head of their MSS. the number of extra 

 their communications which they may wish to have printed, 

 turn proofs, not to be sealed, or inscribed with any thing except corrections, 

 jtice always to be given when communications sent to tliis Journal, have been, 

 fe to be, published also in other Journals. 



ERRATA. 



Si. 89, p. 303, Figure, — the blank segments of circles should extend to the ex- 

 jty K L of the tube ; p. 307, 1. 14 from bot. after from, read the weight of. 



ADVERTISEMENT. 



|!he announcement, (made on the cover of the January No. of this 

 H*nal,) that Prof. J. Liebig's Organic Cheviistry of Agriculture, 

 |ld soon be published, by the Junior editor, is withdrawn ; another 

 Bon of the same work, by Prof. Webster of Cambridge, being al- 

 ly in progress, unknown to th^M||MMi||taBJ|^^his announce- 

 it was made. 



NOTICE. 



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