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IX. Notices of Communications to the Horticultural Society, 

 between January 1, 1824, and January 1, 1825, of which 

 separate Accounts have not been published in the Trans- 

 actions. Extracted from the Minute Books and Papers of 

 the Society. 



At the Meeting on the 6th of January, a plan of a Pine Pit, 

 erected in the Garden of William Form an, Esq. at Penny- 

 darron Place, in Glamorganshire, was exhibited ; it is found 

 to answer all the purposes for which it was designed. The 

 pit is heated from a chamber below it. A flue of the usual 

 construction is carried through the chamber. This flue passes 

 from the furnace, which is situated at one end of the pit in 

 the front part of the chamber, and, turning at the opposite 

 end, is carried into the chimney in the back of the pit ; the 

 flue rises gradually, but more rapidly as it approaches the 

 chimney ; still however the whole rise does not exceed six 

 inches. The top of the chamber is formed with oak beams 

 three inches wide by one and a half thick, placed at intervals 

 of three inches, and supported in the middle by a wall of 

 open brick work ; the beams are covered with a course of turf, 

 on which the tan is placed for the reception of the Pine plants. 

 The warmed air is conveyed into the upper part of the pit by 

 means of small apertures built in the walls, at four inches and 

 a half apart, both in the back and front of the pit, also through 

 iron pipes, resting on the beams and passing through the tan. 

 The ventilation is effected in front by air holes (stopped when 

 necessary by plugs) passing through the wall, and at the back 



