100 ANALYSES OF THE OAT. 



According to this analysis, the acre, to the depth of one foot, contains 



Lime 14769-562 lbs. 



Organic matter 472013-437 



Magnesia 6261-750 



Potash - - ... . - 2178000 



Soda 30219-750 



Chloride of sodium .... 1497 375 



Sulphuric acid 884*812 



Soluble silica 1701-562 



For obvious reasons, the calculations are confined to those elements which exist in the 

 smaller quantities. We have only to compare the analyses and the calculations, to form 

 an opinion of the effects of cultivation. It is supposed that the greater absorbent power of 

 the soil as it is, is due to the organic matter in part added in the manure ; inasmuch as we 

 have fully shown, in another place, that the absorbent power of a soil is mostly due to the 

 presence of organic matter. 



II. The soil of the middle acre was left unmanured ; but it is remarked that it is 

 naturally the best soil of the three acres, as it receives the wash of adjacent lands. 



1. Soil of the middle acre as it tea*. 

 One hundred grains, saturated with moisture, gave 



