r^ *j'-», ,-*. --if* f.j^' a.,1 



THE 



AMERICAN JOURNAL 



OF 



SCIENCE AND ARTS. 



CONDUCTED BY 



BENJAMIN SILLIMAN, M. D. LL. D. 



Prof. Chem., Min., &c. in Yale Coll.; Cor. Mem. Soc. Arts, Man. and Com.; and 



For. Mem. Geol. Soc, London; Mem. Boy. Min. Soc, Dresden; Imp. 



Agric Soc, Moscow; Hon. Mem. Lin. Soc, Paris; Nat. Hist. 



Soc Belfast, Ire.; Pbil- and Lit. Soc Bristol, Eng.; 



Mem. of various Lit. and Scien. Soc in America. 



VOL. XX.-NO. 1.— APRIL, 1831. 



FOR JANUARY, FEBRUARY, AND MARCH, 1831. 



NEW HAVEN: 



PubUshed and Sold by HEZEKIAH HOWE and A. H. MALTBY. 

 PhUaddpMa, E. LITTELL & BROTH ER.^/VeM> York, G. & C. & H. 

 CARVILL.— J5o*<o», HILLIARD, GRAY, LITTLE & WILKINS. 



PRINTED BY HEZEKIAH HOWE. 



