"In a week or fortnight after the bed is made it will heat violently, and probably continue for a fortnight or three weeks or more, especially if of a considerable extent, and must on no account be spawned till the violent heat subsides and becomes reduced only to a gentle warmth, otherwise the spawn will be totally destroyed and the whole work to be done over again, and this is often the cause of so many Mushroom beds proving barren, the spawn perishing at the first setting off."