228 THE MURSERY-BOOK. 



is permeated by the mycelium. The mass should be kept in 

 heat until the whole of it assumes a somewhat cloudy look, 

 but not until the threads of the mycelium can be seen. Or- 

 dinarily, fresh horse manure, cow manure and good loam 

 are mixed together in about equal proportions, enough water 

 being added to render the material of the consistency of 

 mortar. It is then spread upon the floor or in large vats, 

 until sufficiently dry to be cut into bricks. When these are 

 tolerably well dried, mycelium from a mushroom bed or from 

 other bricks is inserted in the side of each brick. A bit of 

 spawn about the size of a small walnut is thus inserted, and 

 the hole is plugged up. The bricks are now placed in a mild 

 covered hot-bed, with a bottom heat of 55 to 65, and left 

 there until the clouded appearance indicates that the mycel- 

 ium has extended throughout the mass. Soil from a good 

 mushroom bed is sometimes used to sow new beds, in place 

 of commercial spawn. Old clumps of mushrooms may be 

 allowed to become dry, and they may then be mixed into a 

 bed. The spores will then stock the soil and produce a new 

 crop. The full-grown mushroom may be laid upon white 

 paper until the spores are discharged, and these spores may 

 then be mixed into the earth. Propagation by spores is little 

 understood, however. (See page 24.) 



Mustard (Srassica or Sinapis species). 



Propagated by seeds. 

 Mutisia. Composite. 



Seeds. Layers and cuttings of growing wood, those of the 

 tender species in bottom heat. 



Mygindia, Rhacoma. Celastrinece. 



Seeds. Cuttings of firm shoots under glass. 

 Myoporum. Myoporinece. 



Seeds, when obtainable. Usually by cuttings of young 

 wood in heat. 

 Myosotis (Forget-me-not). Boraginece. 



Propagated by seeds sown in spring in-doors or in the gar- 

 den. The perennials may also be increased by divisions, in 

 spring, or by cuttings placed under a hand-glass in a shady 

 spot, in summer. 



Myrica (Bayberry, Sweet Gale, Wax Myrtle, Candleberry). 



Myricacece. 



Hardy species mostly by seeds, from which the pulp has 

 been removed. Sow as soon as ripe, or stratify them. Lay- 



