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SCIENCE AND ARTS 



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CONDUCTED BY 



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Professoks B. SILLIMAN, B. SILLIMAN, Jr., 



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JAMES D. DANA 



AIDED 



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IN THE DEPARTMENTS OF CHEMISTRY AND PHYSICS 



BY 



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Dr. WOLCOTT GIBBS 



SECOND SERIES. 



VOL. XIL— NOVEMBER, 1851 



WITH EIGHT PLATES. 



9 



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NEW HAVEN: 



PUBLISHED BY THE EDITORS 



Printed by B. L. IlAMtE»— Printer to Yale College. 



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