J^jb . 73 



vJ p- 



THE 



K- r 



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. Geol. Soc, Paris ; Mem. Roy. Min. Soc, Dresden ; Nat. Hist. See, 



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



Belfast, Ire. ; Phil, and Lit. Soc, Bristol, Eng. ; Hon. Mem. Roy. Sussex 



Inst., Brighton, Eng. ; Lit. and Hist. Soc, Quebec ; Mem. of 



various Lit. and Scien. Soc. in America. 



AIDED BY 



BENJAMIN SILLIMAN, Jr., A. B. 



Assistant in the department of Chemistry, Mineralogy and Geology in Yale College ; Sec. of tlie 



Yale Nat. Hist. Soc, Mem. of the Conn. Acad, of Arts and Sci. ; Cor. Mem. of the 



Lyceum of Natural History, New York, &c. 



VOL. XXXV.— 3 



jr^K^ 



L839. 



NEW HAVEN; 



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