KEEPING MANUJSE UNDER COVEB. 



59 



CHAPTER XV. 



KEEPING MANURE UNDER COYER 



Dr. Voelcker, at the same time lie made the experiments alluded 

 to in the preceding chapter, placed another heap of manure under 

 cover, in a shed. It was the same kind of manure, and was treated 

 precisely as the other the only difference being that one heap was 

 exposed to the rain, and the other not. The following table gives 

 the results of the weighings of the heap at different times, and also 

 the percentage of loss : 



MANURE FERMENTED UNDER COVER IN SHED. 



TABLE SHOWING THE ACTUAL WEIGHINGS, AND PEttCENTAGE OP LOSS IN WEIGHT, 



OF EXPERIMENTAL HEAP (NO. II.) FRESH FARM-YARD MANURE UNDER 



SHED, AT DIFFERENT PERIODS OF THE YEAR. 



It will be seen that 100 tons of manure, kept in a heap under 

 cover for six months, would be reduced to 49.6-10 tons. Whereas, 

 when the same manure was fermented for the same length of time 

 in the open air, the 100 tons was reduced to only 71.4-10 tons. 

 The difference is due principally to the fact that the heap exposed 

 contained more water, derived from rain and snow, than the heap 

 kept under cover. This, of course, is what we should expect 

 Let us look at the results of Dr. Vcelcker's analyses : 



