1847.] Agriculture ofA^eiv York. 137 



One hundred giains when deprived of water and organic mat- 

 ter, gave 



Silica, 11.88 



Alumina and peroxide of iron, - - 0.43 



Carb. lime, 76.84 



Magnesia, ------ 0.64 



Potash and soda, - . - - 0.48 



Fresh water marls of this description are very common, and 

 hence it is important to know the composition. In all the dis- 

 tricts marl has been found, though it is much more abundant and 

 of far greater extent in the middle and western counties than 

 elsewhere. 



Peat is also quite abundant, and is justly considered a valuable 

 acquisition to the farmer's means of enriching his soil. 



The clays received also a share of our attention, and the com- 

 position of several was ascertained. 



Analysis of Albany Clay. 



Total, 99.82 



The lime varies in amount from 4 to 8 per cent, and probably 

 some localities may from 16 to 20. 



Clay from the Mohawk valley contains, however, less lime 

 than the preceding. 



Analysis of Clay from Mohawk Valley. 



Water, 9.75 



Silicates, 71.92 



Free alumina and peroxide of iron, - 14.98 



Carb. lime, 1.75 



Magnesia, 0.70 



Total, - - - - - - 99.10 



Claystones, as they are often called, and which are obtained 

 from these clays, gave a large amount of lime. 



