For *^ale by 



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Published the first day oj 



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1851 



No, 34 



/ second months price %h per year 



T«JE 



AMERICAN JOURNAL 



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OF 



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SCIENCE AND ARTS. 



CONDUCTED BY 



Pkofessors B. SILLIMAN, B. SILLIMAN, Jr., 



AND 



JAMES D. DANA 



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AIDED 



IN THE DEPARTMENTS OF CHP'Vf^STRY AND VMISIC^ 



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De. WOLCOTi GIBBS. 



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' PUBLI3HJED BY THE EDITORS. 



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