442 Description of a mode of heating Pits and Stoves. 



this pipe into the chamber, no safety valve is required. An 

 arched passage, which is closed except when used, goes from 

 the stoke-hole into the chamber to admit a man to clean the 

 flues, or for other purposes. 



I recommend a pit of this description for the growth of 

 Pines, being of opinion that they succeed so much better in 

 pits than in large houses, and I have no hesitation in saying 

 that the frequent failures which occur in Pine growing are 

 too often the consequence, solely, of the size of the house. 



For Pines, the shallow space above the chamber is rilled 

 with tan about eighteen inches or two feet and a half thick, 

 into which the pots are plunged, and the tan by the aid of 

 the steam and flue in the chamber below is kept sufficiently 

 warm. 



There are two large stoves here, thirty feet long by sixteen 

 feet wide, into which steam is also introduced in like manner. 

 In these, the flue, after passing through the chamber as in 

 the pit, is carried along the back wall of the house, and then 

 goes into the chimney near the fire place ; there is a front 

 flue also constructed in the usual manner, which passes from 

 a furnace at the other end of the house, and then goes out at 

 a chimney near that belonging to the other flue. I have 

 mentioned these stoves merely to show how very easy any 

 hothouses of similar dimensions might be converted, to apply 

 the same principle ; the expense of a boiler, and the altering 

 of the flue and pit would be trifling, in comparison with the 

 benefits resulting from the change. Pine plants grown in 

 these houses come to maturity much sooner than in any dry 

 stove. Independent of the beneficial effects that the plants 

 receive in these houses, there is a very great saving in tan, 



