378 FORCING DEPARTMENT. 



temperature in 20 minutes ; as, from the volume 

 contained in the apparatus, it will retain its heat 

 for nearly 24 hours, consequently the water is about 

 milk-warm when the fires are lighted in the after- 

 noons. In the Winter of 1829, which was the 

 severest season in this part of the country within 

 my remembrance, the self-registering thermometers 

 indicated 28 degrees of frost, two different nights 

 that season ; which afforded ample means of ascer- 

 taining the power of the hot-water ; and as both 

 divisions of the Pinery were then at work, the fires 

 were made up both nights, at five o'clock in the even- 

 ing ; one of the compartments was regulated at eight 

 o'clock, at 70 degrees, and the other at 60 degrees ; 

 the dampers were then shut close, so as to confine 

 the heat around the boilers, and prevent it from es- 

 caping out of the chimney, but no fresh fuel was 

 added after five in the evening; the next morn- 

 ing, at eight o'clock, the division that was left at 

 70 degrees the previous night, had lost 10 degrees; 

 and the other, that was regulated at 60 degrees, 

 only 5 degrees during the night. This lapse 

 of 15 hours, without any fresh fuel being added, 

 and that when we had 28 degrees of frost, is 

 a sufficient proof that the hot-water has adequate 

 power to answer all horticultural purposes in the 

 most inclement season, when the apparatus is pro- 

 perly constructed, and is of a sufficient magnitude 

 for giving out caloric, according to the size or area 

 of the house which it is intended to heat. The fur- 

 naces are attended from the shed behind E., in 

 which is also placed cisterns B.B.,for supplying the 

 houses with water. 



