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THE 









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AMERICAN JOURNAL 



OF 



SCIENCE AND ARTS. 



CONDUCTED BY 



PROFESSOR SILLIMAN 



AND 



BENJAMIN SILLIMAN, Jr 



VOL. XLVIIL— APRIL, 1845. 



NEW HAVEN: 



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Mew York, WILEY & PUTNAM, C. S. FRANCIS &. Co., and li. a. ail^l- 

 MAN —Philadelphia, CAREY & HART and J. S. LITTELL— Baltimore, 

 Md N IHCKMAN.— London, WILEY & PUTNAM.— Paris, HECTOR 

 J30SSANGE &■ Co.— Hamburgh, Messrs. NESTLER & MELLE. 



PRINTED BY B. L. HAMLEN 



