131 



American Journal of Science and Arts. 2d series. No. 20, 

 March, 1849. Exchange. 



Verhandlimgen der Russich-Kaisorlichen Mineralogischen 

 Geselischaft zu St. Petersburg. Jahr 1847. Bvo. Pamph. 

 St. Petersburg, 1848. From Charles Cramer. 



Address before the Entonnological Society of London. By 

 William Spence. 8vo. Pamph. London, 1848. From the En- 

 tomological Society. 



Researches in Meteorology. By Bennett Dowler. 8vo. Pam. 

 New Orleans, 1848. From the Author. 



Review of Mr. Solly's book on the Brain. By B. Dowler. 

 8vo. Pamph. From the Author. 



Researches on the Capillary circulation. 8vo. Pamph. By 

 B. Dowler. New Orleans, 1849. From the Author. 



Bulletin de la Societe Geologique de France. 2eme serie. 

 To.no Vf. Feuilles 1-4 (6-20 Septembre, 1848.) From the 

 Socilte, Geologique. 



April 4, 1849. 

 The President in the Chair. 



Present, twenty members. 



Mr. J. E. Teschemacher read a paper giving the results 

 of his measurement of the angles of the mineral recently 

 described by Prof. C. U. Shepard as Arkansite, as fol- 

 lows ; 



Among some crystals of Arkansite kindly presented to me by 

 Prof. C. U. Shepard, I found two or three with extremely brilliant 

 planes, which enabled me to measure the angles with accuracy 

 by the reflecting goniometer. I present herewith, a complete 

 figure of the crystal, and the measurements of nearly all the 

 planes. This has not hitherto been published. 



