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ABIERICAN JOURNAL 



OF 



SCIENCE AND ARTS. 



CONDUCTED BV 



BENJAMIN SILLIMAN, M. D. LL. D. 



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



and For. Mem. Geol. Soc, Hon. Mem. Br. and For. Abor. Protec, Soc, and of Scien. Soc, Mem. 



Geol. Soc, and of the Roy. Inst, of Gr. Brit., London ; Hon. Mem. Lin. and Statis. Socs., 



Paris ; Mem. Roy. Min. Soc, Dresden ; Nat. Hist Soc, Hulle ; Hon. Mem. Agric Soc, 



Bavaria; Imp. Agric. Soc, Moscow; Nat Hist Soc, Belfist, Ire. ; Phil, and Lit 



Soc, Bristol ; and Hon. Mjem. Roy. Sussex Inst, Brighton, Eng. ; Cor. 



Mem. of the Nat Hist Soc, and of the Arclieeological Soc, Athens, 



Greece; Lit and Hist Soc, Quebec; Mem. of various Lit 



and Scien. Soc. in the United States. 



AIDED BY ' 



BENJAMIN SILLIMAN, Jr., A. B. 



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



of the Meteorological Soc, London ; Sec of the Yale Nat Hist Soc; Mem. of the Codd. 



Acad, of Arts and Sci. ; Cor. Mem. of the Lyceum of Natural History, 



New York ; of the Boston Society of Natural History, &c. 



VOL. XXXIX.— No. 1.— JULY, 4840: 



FOR APRIL, MAY, AND^U«E7~lM0i 



NEW HAVEN: 



Sold by A. H. MALTEY and B. & W. NOYES.— Philadelphia, CAREY & 

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 No. 35 Paternoster Row, and JAMES S. HODSON, 112 Fleet St.— Paris, 

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PRINTED BY B. L. HAMLEN. 



Publisbed at IVew Haven, July 15, 1S40. 



