32 Geology and Mineralogy of apart of Massachusetts, &c. 
most important localities are Middlefield and Chester. 
Most of the minerals of these towns have been discovered 
by Dr. E. Emmons of Chester, an indefatigable and 
acute observer. Most of them I have examined, and seen 
them in place. In the account of them I am aided by a 
paper of Dr. E. upon the minerals of these towns, read be- 
fore the Lyceum of Nat. Hist. of the Berkshire Medical 
Institution. This paper mentions about forty species of 
minerals, besides nearly as many varieties and sub-species. 
It is probable that other towns, if they were as thoroughly 
examined, would be found nearly as rich in mineral treas- 
ures as Middlefield and Chester. The former town belongs 
naturally to the county of Berkshire. Many minerals 
which have already been announced, are mentioned for the 
sake of additional remarks. The order and names in 
Cleaveland’s Mineralogy, 2d Ed. are generally followed. 
CLASS I. 
- |. MURIATE OF SODA. 
Spring at New Lebanon. Also, in wells and springs 
along the Hudson. Eaton. 
2. CARBONATE OF SODA. 
Springs. Pittsfield, Williamstown, and Adams. 
3. CARBONATE OF LIME: 
1. Crystallized. 
In lenticular crystals in Williamstown on granular lime- 
stone. Also, in Chester.in fissures in mica-slate with cha- 
basie and stilbite. Here are some interesting forms of the 
crystals. #. A sur sided table, truncated on all its angles, 
terminated at each extremity by planes. 2. Lenticular, 
resulting from the deeper truncations of the angles of the 
preceding. 3. A six sided prism terminated by a six sided 
pyramid—rare. 4. Hexaedral prism, which appears so 
