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THE 



AMERICAN JOURNAL 



OF 



SCIENCE AND ARTS. 



CONDUCTED BY 



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; Mem. Roy. Min. Soc, Dresden; Imp. 



Agiic. 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. XVIII.— No. 2.-JULY, 1830. 



FOR APRIL, MAY, AND JUNE, 1830. 



NEW HAVEN: 



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

 PhikidelpUa, E. LITTELL & BROTHER.— .Vew York, G. & C. & H. 

 CARVILL.— Bo5foH, HILLIARD, GRAY, LITTLE & WILKINS. 



PRINTED BY HEZEKIAH HOWE. 



