^t'^-7^ 



THE 



AMERICAN JOURNAL 



OF 



SCIENCE AND AKTS. 



CO^DUCTED 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; Mein. Roy. Min. Soc, Dresden; Imp. 



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



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



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



VOL. xx.-g:efe^, 1831. 



NEW HAVEN: 



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



PhiladdpUa, E. LITTELL & BROTHER.— „Yew York, G. & C. Si. II. 

 CAKV ILL,— Boston, HILLIALID, GRAY, LITTLE & \V1LKLN3. 



PIIINTED KY HEZEKIAH MOWE. 





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