AMERICAN HOME GARDEN. 



475 



which the larger plants may be set. Place other shelves, as 

 may be found convenient, along the front, or in any spare spaqe, 

 for smaller plants or cuttings. 



It may be heated by a small common brick flue running en- 

 tirely around it under the staging, rising a little as it goes, 

 and connecting with a chimney at the end. If the draught is 

 insufficient, it may be increased by a pretty high wooden ex- 

 tension of the chimney, to be well secured against the wind. 

 If preferred, the heating apparatus figured and described below 

 may be introduced. 



Fig. SOT. 



a. A small copper cylinder furnace, with common stove draught, of which the fire-cham- 

 ber is thirteen inches deep and nine inches diameter, surrounded by a copper water-cham- 

 ber ; whole diameter eleven inches. The draught and fire managed as in a common stove. 



&. The boiler, placed a little higher than the furnace. It may be a barrel, or a metallic 

 vessel, which will radiate more heat. 



c. c. Iron circulating tubes from the water-chamber to the boiler. 



d. Water-tank, to be kept filled. 



e. Supply-pipe from tank to boiler, to be governed by a floating ball or other arrange- 

 ment in the boiler. 



The above apparatus, which may cost some $10, was, I be- 

 lieve, originally intended to be used with tubes only a few 

 inches long, for heating water for domestic uses ; but it serves 

 admirably for a small green-house, in which it may be all hid- 

 den by the staging, &c., except the furnace. Let the arrange- 

 ment be such as to make the course of the circulating tubes as 

 direct as possible between the water-chamber and boiler, rising 

 a little toward the latter. The only danger is of collapse from 

 exhaustion of the water in the boiler below the mouth of the 

 upper tube, and this is entirely removed by attention to filling 

 the tank regularly, and as often as is necessary. A little ex- 

 perience will enable you to regulate the degree of fire to be 

 kept up. A barrel of water, at a distance of sixteen to twenty 



