80 The Limestones, and Lime. [Feb., 



100. 



Specific gravity, 2.47. Per cent of pure lime, 55.78. 



The last specimen is evidently one of the purest limestones 

 which is ever met with, containing only a trace of foreign matter. 

 It will be observed that magnesia, though frequently present, is 

 not in a fixed proportion, and that it is always less than one-half 

 the rock, or less than the carbonate of lime. 



Many other beds are well known, and equally important with 

 those whose composition w^e have given; but these appear to be 

 sufficient to answer our purpose. 



Taconic Limestones of Vermont. 



3. The Rutland quarries, of which Prof. Adams notices two 

 varieties, a greenish and white variety.* 



Analysis. 



Greenish variety. White variety. 

 Carbonate of lime, - 85.45 97.93 



Alumina and iron, - .59 



Silica and mica, - - 14.45 1.68 



100. 100. 



Brandon statuary marble; color, pure white, granular, and in- 

 cluded in the magnesian state. 



Carbonate of lime, - - - 99.51 



" magnesia, - - trace. 



Silica and insoluble matter, - .29 



Water bloss, ... - .20 



100. 



Prof. Adams remarks, that of the former it was confidently ex- 

 pected that they would be found to contain magnesia. The latter 

 is a marble of spotless beauty. 



• Prof. Adams' Report for 1846. 



