1847.] The Limestones, and Lime. 117 



in the midst of these lower Hraestones, some rocks are found 

 which make the best of quicklime in the state. In Chazy, for 

 example, the birdseye limestone is mostly free from magnesia, 

 and is regarded as one of the best rocks for lime; and is exten- 

 sively used in the glass works at Redford, in Clinton county. 

 Composition of the Trenton Limestone in JYew-York — Slaty 

 variety from Plattsburgh. 

 Analysis. 

 Insoluble matter, .... 1.5.60 



Alumnia and per oxide of iron, - - 4.18 

 Carbonate of lime, ... 52.76 

 Carbonate of magnesia, ... 24.87 

 Water, 1.19 



99.60 

 This specimen is also below the average of the rock for purity. 

 It is however a magnesian limestone. If used with the necessary 

 caution, it is well adapted to agricultural purposes. 



Composition of the Calciferous Sandstone of Vermont* — From 

 Milton. 



Analysis. 



Carbonate of lime, - - - 84.45 



Carbonate of magnesia, ... 12.14 



Alumina and iron, ... i_oi 



Insoluble matter, .... 1,50 



Water and loss, .... .90 



100.00 

 Olmsted. 



Composition of the Calciferous' Sandstones and Lower Liinestones 

 in Pennsylvania. 



These rocks are designated in the Pennsylvania and Virginia 

 reports, as formation II. 



Limestone near Easton. Keller &. Abie's quarries. 

 Analysis. 

 Carbonate of lime. 

 Carbonate of magnesia. 

 Alumina and oxide of iron. 

 Insoluble matter. 

 Water and loss. 



Second Annual Report of the Geology of Vermont. 



