60 



PEACTICAL FLOKICULTUIIE. 



badly, owing to the freezing and thawing caused by the 

 great difference between the temperature of the green-house 

 and that of the open air in winter. The difficulty experi- 

 enced in this way has forced us to the conclusion that it is 

 better to construct the walls of posts and boards, lining 

 with brick inside, rather than to use the ordinary solid 8- 

 inch brick wall ; but the best wall for a north or western 

 exposure, when the expense can be afforded, is unquestion- 

 ably the 10-inch hollow wall. 



Figure 19 will show the inside arrangement of the 

 benches, each being exactly 4 feet in width, with a 2-foot 

 space for walks. It will be observed that the back walk is 



Fig. 19. LtfTERIOU OF FORCING IIOUSE. 



elevated, so that the plants on the benches can be conven- 

 iently reached, to arrange plants, water, etc. If for private 

 use, or for visitors, the walks should be widened at least 

 6 inches. The water is supplied by tanks under the mid- 

 dle bench, 8 feet wide by 4 deep, and half as long as 

 the house. These are arranged in sections, and at con- 

 venient distances are placed two of West's Force Pumps, 

 Fig. 11, to which a length of 125 feet of 1^-inch hose is 

 attached. One man or two boys work the pump, while 

 another hand regulates the water over the plants by the 

 sprinkler, so that the plants contained in this building, 



