ANNALS 



LYCEUM OF NATURAL HISTORY, 



Chemical examination of some Minerals, chiejly from 

 America.'^ By Thomas Thomson, M. D. F. R. S. 

 L. ^ E. ^c. Professor of Chemistrij, Glasgoiv. With Notes 

 ly John Torrey, M. D. Professor of Cheni. and Bot. 

 in the University of the State of Neiv-York. 



Read November 5, 1827. 



The following analyses were made in my laboratory during 

 the course of the years 182G and 1827. A considerable 

 number of them were conducted by myself j but a still 

 greater number were entrusted to my practical pupils. Their 

 analyses may be considered as precisely the same with my 

 own, because the methods employed are mine, the reagents 

 and apparatus are mine, and because I carefully superintend 

 every step of the process, till the pupil has acquired sufficient 

 practical skill to conduct an analysis with accuracy. 



The number of analyses was so great, that if I were to 

 give a detailed account of each, I should have to write a 

 treatise instead of a paper. It will shorten this essay very 

 materially, if T premise a (ew observations on my methods of 



* A large proportion of these minerals was sent to Dr. Thomson by Mr. 

 Nuttall and myself. At the request of Dr. Thomson, I have added a few 

 notes of explanation respecting the localities, history, &;c. of some of the 

 specimens. J. T. 



Vol. hi. 2 



