344 
WOBURN PINERY. 
larly from one end to the other. When the fire is lighted under the 
boiler, 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 reser¬ 
voir, 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. Each of 
these houses, or compartments, are capable of containing 70 fruiting 
21 
Pine plants ; 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 temperature. The pipes, boiler, 
and reservoir 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 temperature in 20 minutes; as from the volume contained 
in the apparatus, it will retain its heat for nearly 24 hours, con- 
