138 Agriculture of Kew York. 



Analysis of Claystones. 



Water, 



Organic matter, .... 

 Silicates, . - . - - 

 Free alumina and peroxyde of iron, - 

 Carb. lime, - - . - - 

 Magnesia, 



[Sept, 



6.28 



1.70 

 30.88 



9.42 

 53.98 



0.22 



99.42 



The limestones, which occupy a large area in the state of New 

 York, are important as fertilizers, and deserve a very careful ex- 

 amination. The following analyses were made with a view of 

 determining their value in agriculture. 



Analysis of Tully and Onondaga Limestones. 



The lower limestones, as the Chazy and Trenton, contain fre- 

 quently a large but variable amount of magnesia, as well as in- 

 soluble matters in the form of slate or silica. The calciferous 

 sandstone contains several drab-colored beds, which form a very 

 good cement. These layers are raagnesian. 



• These limestones are often dolomites, and contain from 20 to 40 per cent 

 of magnesia. 



t Often ilisseminated through the rock, and sometimes in masses weighing 

 twenty pounds. 



