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THE 



AMERICAN JOURNAL 



OF 



SCIENCE ANB 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. Gcol. Soc, Paris ; Mem. Roy. Min. Soc, Dresden ; Nat. Hist. Soc, 



Halle ; Imp. Agric Soc, BIoscow ; Hon. Mem. Lin. Soc, Paris ; Nat. Hist. Soc, 



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



Inst, Brigliton, 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 the 



Yale Nat. Hist. Soc, Mem. of the Conn. A ■.'■;!, nl" Arts and Sci. ; Cor. Mem. of the 



Lyceum of Naturtii tiLu'ji >■, New York, &c. 



VOL. XXXIV.— WfcT?, 1838. 



NEW HAVEN: 



Sold by A. H. MALTBY and B. & W. NOYES. —PhUadelphia, CAREY & 

 HART and J. S. lATTELh.— Baltimore, Md., N. HICKMAN.—JVeM; York, 

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PRINTED BY B. L. HAMLEN. 



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