^■<S9!Wy^ 



THE 



A3IEIIICAN 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, Hon. Mem. Br. and For. Abor. Proiec. Soc, and of Scien. Soc, Mem. Gcol. 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, Halle; Hon. Mem. Agric Soc, Bavaria; Imp. Agric Soc, Moscow; 

 Nat. Hist. Soc, Belfast, Ire. ; Phil, and Lit. Soc, Bristol ; and Hon. Mem. Roy. Sussex Inst., 

 Brighton, Eng. ; Cor. Mem. of the Nat Hist. Soc, and of the Archsological Soc, Athens, 

 Greece ; Lit. and Hist. Soc, Quebec ; Member of various Literary and Scientiflc Societies in 

 the United States. 



AIDED BY 



BENJAMIN SILLIMAN, Jr., A.M. 



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



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



Mem. of the Lyceum of Natural History, New York ; of the 



Boston Society of Natural History, &c 



VOL. XXXIX.— No. 2.— OCTOBER, l840. 



FOR JUtY, AUGUST, AND SEPTEMBER, 1840. 



NEW HAYEN: 



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PRINTED BY B. U. HAMLEN. 



'\ Publislied at New Haven, iSept. 25, 1S40. 



