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AMERICAN JOURNAL 



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OF 



SCIENCE AND ARTS 



CONDUCTED BY 



PROFESSORS B. SILLIMAN, B. SILLIMAN, Jr., 



AND 



JAMES D. DANA, 



IN CONNKCTION WITH 



PROF. ASA GRAY, of CAMBRIDGE, 

 PROF. LOUIS AGASSIZ, of CAMBRIDGE, 

 DR. WOLCOTT GIBBS, of NEW YORK. 



SECOND SERIES. 



VOL. XXIV.-NOVEMBER, 1857. 



WTTU SKVEX PLATES. 



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NEW HAVEN: EDITORS 



B. HAYK?!, PniNTKR 



Mi»»ouPi Botanical 

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