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THE 



AMERICAN JOURNAL 



OF 



SCIENCE AND ARTS. 



CONDUCTED BY 



PROFESSOR SILLIMAN 



AND 



BENJAMIN SILLIMAN, Jr. 



YOL. XLIY.— APRIL, 1843. 



NEW HAYEN: 





9t 



% 



Sold by B. NOYES;— Boston, LITTLE & BROWN and W. H. S. JORDAN.— 

 New York, WILEY & FUTNAM, C. S. FRANCIS & Co., and G. S. SILLI- 

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

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PRINTED BY B. L. HAMLEN. 



