THE 



AMERICAN JOURNAL 



OF 



SCIENCE AND ARTS 



^ 



CONDUCTED BY 



PROFESSOR SILLIMAN 



BENJAMIN SILLIMAN, Je. 



VOL. XL.— APRIL, 1841. 



(TO BE CONTINUED QUARTERLY.) 



NEW HAVEN: 



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

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 and G. S. SILLIMAN, No. 44 William St.— Boston, C. C. LITTLE & Co.— 

 London and jYew York, WILEY .& PUTNAM, No. 33 Paternoster Row, Lon- 

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