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THE 



AMERICAN JOURNAL 



OF 



SCIENCE AND ARTS. 



CONDUCTED BV 



BENJAMIN SILLIMAN, M. D. LL. D. 



Prof. Chem., Min., &c. in Yale Coll. ; Cor. Mem. Soc. Arts, Man. and Com. ; and 



For. Mem. Geol. Soc, London; Mein. Roy. Min. Soc, Dresden; Imp. 



Agric Soc, Moscow; Hon. Mem. Lin. Soc, Paris; Nat. Hist 



Soc Belfast, Ire.; Phil, and Lit. Soc. Bristol, Eng.; 



Mem. of various Lit. and Scien. Soc in America. 



VOL. XIX.-J;il?©3tKl^,M831. 



NEW HAVEN: 



Published and Sold by HEZEKIAH HOWE and A. H. MALTBY. 

 Philadelphia, E. LITTELL & BROTHER.— JVcmj York, G. & C. & H. 

 CAKVILL.— Boston, HILLIARD, GRAY, LITTLE S:. WILKINS. 



PRINTED BY HEZEKIAH HOWE. 



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