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the back, 3 feet from the glass, and with another in 

 front, 5 feet from the glass. The front of the house 

 is 6 feet high abo\e the walk, and the upper portion 

 is glazed to the depth of 4 feet. At both ends of 

 the house there is a flight of 6 steps from the front 

 walk to the back one, which is on a level with the 

 front of the pit. The latter stands in the centre of 

 the house, its slope corresponding with that of the 

 roof ; but instead of being heated by bark in the ordi- 

 nary manner, the roots of the plants are warmed by 

 means of hot water pipes passing beneath them. 

 For this purpose the pit is surmounted by a boarded 

 stage, containing 4 shelves, with openings in them to 

 receive the pine pots up to the rims. Each shelf is 

 2 feet in width, and capable of containing 2 plants. 

 The hot water pipes in the pit and those which warm 

 the house are on the same level, and communicate 

 with each other, so that only one fire is required. 

 These pipes are all dished, for the purpose of holding 

 water to create steam. The dishes in the pit are 

 filled by means of one-inch leaden pipes, one end of 

 which comes through the stage ; and these are filled 

 twice a day with hot water. There are also six small 

 one-inch iron pipes, about eighteen inches long, which 

 stand upright, and are screwed into the main pipes 

 beneath the stage ; the tops of these you can open 

 or close, according as more or less moisture is re- 

 quired. The succession house is 25 feet long, 18 



