1847.] The Limestones, and Lime. 71 



2. Limestones of Massachusetts. — The following analyses of the 

 primary limestones were made by President Hitchcock,* for the 

 Agricultural Survey of Massachusetts. These limestones are as- 

 sociated with gneiss and mica slate, and are often considered as 

 interlarainated beds. In the western part of the state, the rock is 

 not uncommon, and undoubtedly extends north and south along or 

 near to the ridge of the Green mountains! These beds should be 

 distinguished from those belonging to the Taconic system, which 

 appear along the western flank of the same range. 



Limestones of Becket, Berkshire county, Mass. 



Jinalysis. 



Carbonate of lime, . - - 58.31 

 Carbonate of magnesia, - - -28.61 

 Peroxide of iron, - _ - 1.24 



Alumina and silica, _ - - 11.84 



100. 

 Specific gravity, 2.84. Per cent of quicklime, 32.65. 



Limestone of Middlefield, Hampshire county. Coles brook; 

 color white, crystalline. 



Analysis. 



Carbonate of lime, - > - 56.25 



Carbonate of magnesia, - - - 31.56 



Peroxide of iron, - - - 1. 12 



Silica and alumina, - - . 11.07 



100. 

 Specific gravity, 2.78. Per cent of lime, 31.50. 



Limestone of Blandford, Hampden county; color white. 



Jinalysis. 



Carbonate of lime, - - - 51.66 



Carbonate of magnesia, - - - 39.48 



Peroxide of iron, - - _ Q.gj 



Silica and alumina, - - _ 7.95 



100. 



Specific gravity, 2.77. Per cent of caustic lime, 28.93. 



Micaceous limestone of Ashfield, Hampden county, two speci- 

 mens. 



• Hitchcock's Report, pp. 80, quarto edition. 



