HORTICULTURAL SOCIETY. 



209 



will span a twenty foot house. Every third one of the upper row, is 

 left unnailed to use as ventilator. The sashes are supported by two 

 purlins, one at each lap, and are stayed with a 2x4 inch post. (R. 



R. Fig. 1). These also serve to hold the center bench, and at every 

 other joint of the sash two by four inch rafters are placed. (D. D, 

 D. Fig. 1). The posts that support the outside benches C. C., are 

 nmall oak saplings driven into the ground. On these posts, two 

 by four inch pieces are nailed to support the bench. On them are 

 put the bottom boards one-half inch apart. The soil is about five 

 inches deep in the benches. 



This house is heated by a furnace and flue. The furnace is six 

 feet by four feet, outside measure. It is built at the West end of 

 the house, with about one-third of it in the furnace room. (Fig. 2). 

 The top of the furnace is a little below the level of the bottom of 

 the house, so that the flue A, rises abruptly at first, but still allows 

 a gentle rise along its entire length, the return flue B, comes on 

 top of the furnace and enters the chimney which is on the furnace. 



This furnace is made large so that we may burn old grubs, roots, 

 etc., which is the only fuel wp use, and its walls are eight inches 



C^ 



j\3. a> 



thick with a layer of fire bricks inside of them, (these fire brick 

 extend along the flue about twelve feet). The rest of the flues 

 are made of common hard brick in this way: — A layer of 

 brick is put on the ground a foot wide to serve as a foundation. 

 On each side of this a tier of four bricks set on their edges 

 are placed. These are drawn together at the top enough, to 

 allow one brick to cover the flue. Before the top brick is put on, 

 the inside of the flue is covered with mortar to act as an extra 

 preventive against the escape of any gas or smoke. Then the top 



-14- 



