PROPAGATING HOUSE. 47 



A SINGLE-ROOFED HOUSE. 



The single roof or lean-to houses are usually preferred 

 by propagators in the more northern States, as they are 

 less exposed to cold, being often built against a side-hill or 

 some building ; where such a protection is not convenient, 

 then a wall is built running east and west, or nearly so, 

 and the roof is placed against this, sloping to the south. 



Fig. 13 shows a lean-to house, with interior arrange- 

 ments similar to that of the span-roofed house. The fur- 

 nace and general store-room is built against the north side, 

 instead of at the end. This not only affords a protection to 

 the wall, but gives a good-sized room for storing the com- 

 post, sand, etc. Four hot-water pipes pass the whole 

 length of the house, as shown. The boiler and furnace are 

 set in the room back of the wall, and the pipes pass through 

 it into the house. The chimney may be built in the wall 

 or be carried up by its side. When brick or tile are used 

 for flues, then a brick furnace is made in the wall, the 

 greater part of it within the house ; but the door should 

 open outside, so that when opened the gas from the tire 

 may escape into the furnace room. The furnace should be 

 placed so low that the flue may gradually rise from it to 

 the point where it connects with the chimney, and still not 

 come too near the bottom of the cutting frames. If the 

 furnace is placed with its top level with the surface of the 

 ground within the house, and the flue be made to rise one 

 foot, rather abruptly, as it leaves the furnace, it may then 

 be carried fifty feet with not more than six inches rise, 

 and stih 1 it will have sufficient draft. If the house is fifty 

 feet long, the flue should pass under the frames at the 

 front, and return under those at the back, the chimney 

 being near the furnace. 



The point where it enters the chimney should be at least 

 eighteen inches above the top of the furnace. Of course, 



