If the heap of manure, therefore, is moist enough and large enough, all the evidence goes to show, that there is little or no loss of ammonia. If the centre of the heap gets so hot and so dry that the ammonia is not retained, there is still no necessity for loss. The sides of the heap are cool and moist, and will retain the carbonate of ammonia, the acids mentioned also coming into play. The ammonia is much more likely to escape from the top of the heap than from the sides. The heat and steam form little chimneys, and when a fermenting manure-heap is covered with snow, these little chimneys are readily seen. If you think the manure is fermenting too rapidly, and that the ammonia is escaping, trample the manure down firmly about the chimneys, thus closing them up, and if need be, or if convenient, throw more manure on top, or throw on a few pailfuls of water. It is a good plan, too, where convenient, to cover the heap with soil. I sometimes do this when piling manure in the field, not from fear of losing ammonia, but in order to retain moisture in the heap. With proper precautions, I think we may safely dismiss the idea of any serious loss of ammonia from fermenting manure. THE WASTE OF MANURE FROM LEACHING. As we have endeavored to show, there is little danger of losing ammonia by keeping and fermenting manure. But this is not the only question to be considered. We have seen that in 10,000 lbs. of fresh farm-yard manure, there is about 64 lbs. of nitrogen. Of this, about 15 lbs. are soluble, and 49 lbs. insoluble. Of mineral matter, we have in this quantity of manure, 559 lbs., of which 154 lbs. are soluble in water, and 405 lbs. insoluble. If we had a heap of five tons of fermenting manure in a stable, the escape of half an ounce of carbonate of ammonia would make a tremendous smell, and we should at once use means to check the escape of this precious substance. But it will be seen that we have in this five tons of fresh manure, nitrogenous matter, capable of forming over 180 lbs. of carbonate of ammonia, over 42 lbs. of which is in a soluble condition. This may be leached day after day, slowly and imperceptibly, with no heat, or smell, to attract attention.