33 



MUSHROOMS, HOW TO GKOW THEM. 



spacious stokehole. Here it is set under the staiVway in 

 a pit four and one-half feet long, by three feet wide, by 

 eighteen inches deep ; it is not in the way, and there is 

 plenty of room to attend to it. The heater, like a com- 

 mon parlor stove, has a magazine for the supply of coal. 



Fig. 5. BASK-BUKNING WATER 



Heatek. • 



Fig. 6. Vertical Section. 



It has a double casing with the water space between and 

 down to the bottom of it, so that when set in a shallow 

 pit there is no difficulty whatever about the circulation 

 of the water in the pipes. The hot water passes from 

 the boiler to an open iron tank placed two feet above it, 

 as shown in the engraving, and thence down through a 

 perpendicular pipe till it reaches and enters the hori- 

 zontal pipes that pass around the cellar and, returning, 

 enters the boiler again near its base. The boiler and 

 pipes are filled from this tank, which should always be 

 kept at least half full of water, and looked into every 

 day when in use, so that when the water gets lower than 

 half full it may be filled up again: About 134 running 

 feet of four-inch pipe are included inside the cellar 

 (sixty-four feet on each side and six feet across at further 

 end) ; this gives 134 square feet of heating surface, or a 



