CoorEKATIVE WOEK WITH COLUMBIA UnIVEKSITY 



iu9 



regards exposure to sunliglit and protection from cold winds. The 

 greater the number of hours of sunshine during the month, the 

 smaller the coal bill. Manure and fuel must be accessible. The 

 soil on the immediate site ought to be such that it can be readily 

 adapted to this very intensive form of agriculture, or, at least, 

 such soil ought to be within a very short haul. A sandy loam of 

 excellent physical quality is needed. The fertility of the new 

 soil is less important, because it must be radically improved in 

 any case. Finally, a good market and ample means of reaching it 

 must not be forgotten. 



EQUIPMENT 



Frames 



The equipment 'for vegetable forcing may be of various forms. 

 The simplest is a cold frame, which consists merely of an inclosure, 



Fig. 560. Sl.MI'l.KS I ImiIIM (iK .MAMKK lln|l;l.|i li;i. 



Placed ors" a I^ile of Fermeoytikg ^Ianure 



l;A.\ii-: IS 



perhaps eight to fifteen inches deep, covered with glass sash, or 

 even with cloth. At times, additional protection is given in the 

 form of mats of some kind. 



Wlien such a frame is heated by means of fermenting manure 

 or by pipes from a hot-water or steam boiler, it becomes a hotbed, 

 and may be used throughout a greater proportion of the year. 



