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AMERICAN JOURNAL 



OF 





SCIENCE AND ARTS 



CONDUCTED BY 



Professors E. SILLIMAN and B. SILLIMAN, Jr., 



AND 



JAMES D. DANA. 



SECOND SERIES. 



VOL. VII.— MAY, 1849 



NEW HAVEN: 



PRINTED FOR THE EDITORS BY B. L. HAMLET, 



Printer to Yale College. 



Sold by Day & Fitch, New Haven.— Little & Brown, and T. Wiley, Jr., Boston.— 

 C. S. Francis & Co., George P. Putnam, and John Wiley, iVewj York.— Carey <fe 

 Hart, Philadelphia. — George P. Putnam, 142 Strand, London. — Hector Bossangi 

 <fe Co.) Paris.— Kestlk r & Melle, Hamburgh. 





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