72 



GENERAL ADVICE 



plank upon the north is ordinarily ten to twelve 

 inches wide, and that upon the south eight to ten 

 inches. These planks are held in place 

 by stakes, and the sashes are laid 

 across them. Seeds of radishes, beets, 

 lettuce, and the like, are then 

 sown beneath the sash, and 

 when settled weather 

 arrives the sash and 

 planks are removed 

 and the plants are 

 growing naturally in 

 the field. Half-hardy 

 plants, like those men- 

 tioned, may be started 

 fully two or three 

 weeks in advance of 

 the normal season by this means. 



One of the simplest types of coldframes is 

 shown in Fig. 74, which is a lean-to against the 

 foundation of a house. A sill is run just above 

 the surface of the ground, and the sashes, shown 

 at D, are laid upon rafters which run from this sill 

 to the sill of the house, A. If this frame is upon 

 the south side of the building, plants may be 

 started even as early as a month before the open- 

 ing of the season. Such lean-to frames are some- 

 times made against greenhouses or warm cellars, 

 and heat is supplied to them by the opening of a 

 door in the wall, as at B. In frames which are in 



74. Coldframe 

 against a building. 



