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XXXVIII. An Account of Mr. Walker's improved Con- 

 struction of Hot-house Flues. % Alexander Seton, 

 Esq. F.H.S. 



Read, October 3d, 1820. 



So much attention having of late been paid to the construc- 

 tion of Hot-houses and Green-hnuses, and so many commu- 

 nications having been made to the public respecting them, it 

 may be supposed that there is little room left for the exertions 

 of genius and science in that art; but I am persuaded that this 

 is far from being the case, and that much may still be done 

 towards its improvement. With this view I hope the Socie- 

 ty will not deem unworthy of attention the following short 

 account of a new Mode of constructing flues, invented by 

 Mr. James Walker, whose abilities as an engineer are well 

 known, and executed under his direction in a green-house 

 erected for Thomas King, Esq. at Stamford Hill ; and par- 

 ticularly so, as I am not aware of this mode being generally 

 known, or of any thing of the kind having been adopted 

 elsewhere. 



The flue for conveying the smoke consists of an iron 

 pipe, in this example square of eight inches on each 

 side ( but it does not seem material whether it be square or 

 round), which is conducted in the usual manner from the 

 furnace at one end, along the house and back to the chimney 

 at the same end. This is inclosed in a thin case of brick or 

 stone, and covered with flags about two feet and a half high, 



