GREEN-HOUSE STRUCTURES. 



103 



strength, in proportion to bulk, than white pine. It is 

 also necessary to use glass not less than 10 x 12, put in the 

 12 way. This style of green-house is now preferred 

 for forcing Lettuce, Strawberries, and other fruits and 



FIGURE 5. (Scale ^ of an inch to the foot.) 



vegetables in winter, as well as flowering plants, as they 

 too require all the light that it is possible to obtain. 



Although this style of green-house would also shade, 

 if joined together on the ridge and furrow plan, when 

 built on level ground, yet, whenever a convenient loca- 

 tion can be had, where the ground slopes to the south at 

 an angle of 10 or 15 degrees, they maybe joined together 

 as seen in Figure 6, (one-eighth of an inch to the foot 

 scale,) which shows a slope or angle of 1 5 degrees. 



It will be noticed in this design (Figure 6) that the 

 larger number of pipes are placed under the front bench, 

 there being four there, while there are only two under 

 the back bench. The slope of the ground makes this ar- 

 rangement necessary in order to secure an equal distribu- 

 tion of heat. With the ordinary arrangement of pipes, 

 (half under each bench,) the back of the house would 

 always be much the warmest, as a moment's reflection 



