346 On growing Mushrooms in Houses. 



uppermost), till the pile is three feet high, next cover it with 

 a small portion of warm horse dung, sufficient in quantity to 

 diffuse a gentle glow through the whole. When the spawn 

 has spread itself through every part of the bricks, the pro- 

 cess is ended, and they must be laid up in any dry place 

 for use. Mushroom spawn, made according to this receipt, 

 will preserve its vegetative power many years, if well dried 

 before it is laid up ; if moist, it will grow, and soon exhaust 



