THE 



ABIERICAN JOURNAL 



OF 



SCIENCl:} AND ARTS. 



CONDUCTED BY 



BENJAMIN SILLIMAN, M. D. LL. D. 



Prof. Chem., Min., &c. in Vale Coll. ; Cor. Mem. .«oc. Arts, Man. and Com. ; ami For. Mem. Geol. 



Soc, London; Mem. Gcol. Soc, Piiris; Mem. Roy Min. t-oc, Dresdi^n ; Nut. Hist, t-oc, 



Halle; liiip. Agric. Soc, Moscow; (Ion. Mem. Lin. Soc, Par;s; Nat. Hist. :.oc;., 



Belf-st, Le. ; Phil, and Lit. tioc, Bristol, Eng. ; Hon. Mem. Roy. Sussex 



Inst., Brighton, Eng ; I-it. and Hist ^oc, 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 the 



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



Lyceum of Natural History, New Yorli, &c. 



VOL. XXXIV.— No. 3.— JULY, 1838. 



FOR APRIL, MAY, AND JUNE, 1838. 



NEW HAVEN: 



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