FORCING DEPARTMENT. 377 



filled with water, flowing from the boiler, as the 

 pipes, reservoirs, and boilers, are placed all on the 

 same level, and filled about equally, within half an 

 inch of the top, so as to allow room for circulating 

 the heat regularly from one end of the house to the 

 other. 



When the fires are lighted under the boilers, the 

 water, as soon as it begins to get hot, immediately 

 ascends to the top of the boiler, and flows along the 

 upper pipe, to the reservoirs, when it forces the cold 

 before it in the under pipe back into the bottom of 

 the boiler. The circulation of water is continued 

 from one extremity of the house to the other ; the 

 hottest passing rapidly along the upper pipe, and 

 the coldest returning through the lower one, back 

 into the boiler, which will soon heat the pipes so as 

 to raise the atmosphere of the house, in the severest 

 weather, from 75 to 80 degrees, and that when we 

 have had 28 degrees of frost. These houses, or com- 

 partments, are capable of containing 70 fruiting Pine 

 plants each ; the atmosphere of the house may be 

 kept regularly from 60 to 65 degrees, in the severest 

 weather, without consuming more than three-fourths 

 of a bushel of coals to each division ; or a bushel and 

 a half to the two compartments. The fermenting 

 leaves in the pits also assist in keeping up this tem- 

 perature. The pipes, boilers, and reservoirs in each, 

 contain about 140 gallons of water; when the fires 

 are first lighted to the Pinery, the furnaces, &c. being- 

 then cold and damp, it takes about an hour to heat 

 the water to 130 degrees ; but when it is once heated, 

 after the first night, it may be raised to the same 

 3 c 



