

THE 



AMERICAN JOURx^AL 



OF 



SCIENCEAND ARTS. 



CONDUCTED BY 



BENJAMIN SILLIMAN, M. D. LL. D. 



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



and For. Mem. Geo!. Soc, London ; Mem. Geol. Soc, and [Ion. Mem. Lin. and Statis. Socs., 



Paris; Mein. Roy. Min. Soc, Dresden ; Nat. Hist. Soc. Halle; Imp. Aj;ric Soc, Moscow; 



Nut. Hist. Soc, Bell" st, Ire.; Phil, and Lit. Soc, Bristol, Eng. ; Hon. Mem. Roy. 



Susse.x Inst., Brig-hion, Eng ; Cor. Mem. of the Nat. Hist. Soc, and of the 



Archseolcgical Soc, Athens, Greece; Lit. and Hist. Soc, Gluebec; 



Mem. of various Lit. and Scien. Soc. in the U. States. 



AIDED BY 



BENJAMIN SILLIMAN, Jr., A. B. 



Assistant in the department of Chemistry, Mineralogy and Geology in Yale College; Cor. Mem. 



of tlie Meteorological Soc, London ; Sec of tlic Vale Nat. Hist. Soc, Mem. of the Conn. 



Acad, of Arts and Sci. ; Cor. Mem. of the Lyceum of Natural History, New York, &c, 



VOL. XXXYI— No. 2— JULY, 1839. 



FOR APRIL, MAY, AND JUNE, 1839. 



NEW HAVEN: 



Sold by A. H. MALTBY and B. & W. NOTES.— Philadelphia, CAREY & 

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PRINTED BY B. L. HAMLEN. 



Published at New Haven, June 20, 1§39, 



