"Until the present... nothing has been discovered that is as suitable and available as animal manures. Of these, that of the horse is the best. This, to be entirely suitable, should come from stables where the animals are fed on hard grains and hay. The bedding should be straw and well soaked with urine. Any long unsoiled straw should be taken out. Some of the older growers used to discard practically all of the straw and use nothing but the droppings. Manure from stables where the owners are careless about keeping them clean will often produce a better crop than that from stables where the soiled straw is removed each day and replaced with fresh. Avoid manure from stables where old hay is used for bedding..."