/ 



THE 



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., Cor. Mem. Met (3oc., 



and For. Mem. Geol. Soc, Hon. Mem. Br. and For. Abor. Protec. Soc, andof 8cien. Soc, Lon 



don ; Mem. Gcol. Soc, and Hon. Mem. Lin. and Stutis. Socs., Paris ; Mem. Roy. Min. Soc, 



Dresden'; Nat Hist Soc, Halle; Hon. Mem. Agric Soc, Bavaria; Imp. Agric Soc, 



Moscow; Nat Hist Soc, Belt*, st, Ire.; Phil, and Lit. Soc, Bristol, Eng. ; Hon. 



Mem. Roy. Sussex Inst., Brigiitoii, Eng. ; Cor. Mem. of the Nat Hist Soc, 



and of the Arcliaeological Soc, Athens, Greece; LU. and Hist Soc, 



Quebec; Mem. of various Lit end Scien. Soc in the U. States. 



AIDED BY 



BENJAMIN SILLIMAN, Jr., A. B. 



Assistant hi 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 Coon. 



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



New York ; of the Boston Society of Natural History, Ac 



VOL. XXXVIIL'-No. 2.— APRIL, 1840. 



FOR JANUARY, FtBRLARY, AND MARCH, 1840. 



NEW HAVEN: 



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

 HART and J. S. LlTTEhL.— Baltimore, Md., N. HICKMAN— JVew York, 

 CARVILL «& Co., No. 108 Broadway, and G. S. SILLIMAN, No. 44 Wil- 

 liam St.—Bostmi, C. C. LITTLE & Co.— -London, JAMES S. HODSON, 

 No. 112 Fleet St., and WILEY & PUTNAM, 35 Paternoster Vioyr.— Paris, 

 J. B. BAILLIERE, Libraire, Rue de L'Ecole-do-Medecine, No. 13 bis. — Ham- 

 burgh, Messrs. NESTLER & MELLE. 



PRINTED BY B. L. HAMLEN. 



PublisSied at New Haveu, April 6, 1S40. 



