98 GARDENING FOR THE SOUTH. 



an ordinary cast-iron door and ash pit. An arch is turned 

 over the fire-box, and the flue is built from the rear cud 

 on a sharp ascent to the level of the floor of the house. 

 It should then be built along under the side benches, on 

 a slight ascent, the whole length of the house, across the 

 farther eud and back to the chimney over the furnace. 

 flic first ten or fifteen feet should always be made of 

 brick, the remainder of six-inch terra cotta pipe. The 

 furnace may be made to burn wood, and in that case no 

 grate bars will be needed, so the fire can be regulated 

 by a draft hole in the door. But a coal-burniug furnace 

 is far more convenient, and the fire will last longer. For 

 seed-sowing purposes it is better to have the flue boxed 

 in under the benches, but in this case hinged doors should 

 be made along the walk, so as to let more heat out in the 

 house when needed. 



A greenhouse of this character can be built 10x50 feet 

 for about f 150. For heating more thoroughly and satis- 

 factorily than can be accomplished with the brick furnace 

 above described it is best to use a boiler and circulate 

 hot water or steam in iron pipes. This method of heating- 

 will slightly increase the cost estimated above. 



