100 ANALYSES OF THE OAT. 



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



Lime 14769 '562 lbs. 



Organic matter 472013-437 



Magnesia 6261-750 



Potash 2178 000 



Soda 30219-750 



Chloride of sodium .... 1497-375 



Sulphuric acid 884-812 



Soluble silica 1701 "562 



For obvious reasons, the calculations arc 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 was. 

 One hundred grains, saturated with moisture, gave 



Water 25-823 



Dry soil 74-177 



100 grs. of dry soil gave 



Organic matter ...... 4*085 



Water 2-220 



Silica 85-185 



Alumina and peroxide of iron - - - 5 '610 



Soluble silica 0-075 



Lime 0-19S 



Magnesia -.-.... 0-044 



Potash 0-158 



Soda 1-093 



Chloride of sodium 0-019 



Sulphuric acid ...... trace. 



Phosphates appreciable. 



98 687 S. 



