Construction of Frames 



341 



boards loosely nailed together. If one expects to use cold- 

 frames or hotbeds every year, however, it is advisable to 

 make the frames of heavier stufE, well painted, and to join 



the parts by bolts 

 or tenons, so that 

 they may be taken 

 apart and stored. 

 Pig. 209 suggests 

 methods of making 



209. A method of making a collapsible frame. fhp frames SO that 



they may be taken apart. The pieces for the sash to slide 

 on are made of stuff three inches wide mortised into the 

 frame. These pieces have a strip or mounting nailed along 

 their middle to hold the sash to its place. Fig. 310 (from 

 Cornell Eeading-Course Lesson) shows the details of a 

 two-sash coldframe before the parts are nailed together. 



The depth of the frame must be governed largely by 

 the plants it is desired to grow, and by the length of time 



210. The five members of a two-sash frame. 



they are to remain in the bed. It is well to have the 

 plants as near the glass as possible and yet give them room 

 in which to grow. If the frame sets on top of the manure^ 



