■' THE 



AMERICAN JOURNAL 



OF 



SCIENCE AND ARTS. 



CONDUCTED BY 



PROFESSOR SILLIMAN 



AND 



BENJAMIN SILLIMAN, Jr. 



VOL. XL:— No. L— JANUARY, 1841. 



FOR OCTOBER, NOVEMBER, AND DECEMBER, 1840. 



(TO BE CONTINUED QUARTERLY.) 



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PRINTED BY B. L. HAMLEN. 



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