288 



PRINCIPLES OF AGRICULTURAL CHEMISTRY 



and to prevent loss by excessive fermentation, and also to cause 

 the manure to decompose evenly. When thoroughly rotted, the 



Fig. 68. The Grignon system of keeping manure. 



Fig. 69. Liquid manure spreader. Switzerland. 



manure is very dark, brittle mass, and is said to be very effective 

 in its action. 



