PINERIES. 



335 



so small a scale as to be scarcely intelli- 

 gible ; we have therefore re-drawn it to a 

 scale double the size : — 



"I have been long impressed, indeed con- 

 vinced," says Mr Henderson, " that how- 

 ever successful has been the result, in many 

 cases, in connection with the tank and 

 open-gutter system, no mode of heating 

 can be considered complete unless so 

 arranged as that either a moist or dry heat 

 may be obtained or modified at pleasure. 

 To effect this, then, you will see that the 

 open gutter and hot-water apparatus are 

 combined in the accompanying plan. The 

 pipes being laid in the gutter c c, will 

 readily suggest the facility with which 

 the atmosphere may be charged with 

 moisture : or, on the contrary, when a dry 

 heat is desired, the water has only to be 

 withdrawn from one or either of the 

 gutters, just as may be deemed proper. 

 The bottom heat to the plunging or 

 planting-out bed a, is communicated 

 through the brick arch from chamber b. 

 Brickwork is found to be by far the best 

 medium — the porous material being a 

 good conductor, as well as a guarantee 

 that no accident can happen from over- 

 heating the roots ; while no difficulty will 

 be found in raising the temperature of the 

 tan or soil in the bed to 75° or even 80°. 

 The pipes laid in gutter c, in front, are for 

 supplying the necessary heat to the atmo- 

 sphere of the house, and of course can be 

 wrought from the same boiler, with, or 

 independent of, the pipes in the chamber b. 

 A rotatory motion is given to the air in 

 the house — a siphon action being formed 

 by admitting the heavier, viz., the cooled 

 air, at the register gratings (c c c in 

 ground-plan,) through the aperture I, 

 which, displacing the heated air in the 

 chamber, escapes through the higher 

 cavity m. Thus a constant circulation is 

 kept up — an object so desirable and so 

 well understood by all practical men, but 

 which has hitherto been very much 

 neglected. As it is intended to have an 

 early crop of grapes in the stove, and that 

 the vines may not be deprived of their 

 due period of rest, but at the same time 

 to avoid the necessity of turning them 

 outside of the house, an area is formed, 

 as at d, where the vines are planted, their 

 roots having free access to the border 

 through the arches of the front wall. At 

 the proper season the vines are detached 



from the training wires, and carefully 

 laid down in the area — a shutter being 

 nicely fitted over them at e. The front 

 ventilators at h being opened, a circula- 

 tion of cold air is admitted, and they 

 remain in this state till the forcing 

 season comes round again." 



Reference to section : " a bed to plunge 

 or plant out in; b hot-air chamber; c 

 gutter, with pipes, supplying heat to the 

 atmosphere ; d area, where vines are 

 planted and laid down during the season 

 of rest ; e a closely fitted shutter is fixed 

 here while the vines are laid down ; / 

 and g show an offset in brickwork, which 

 carries the back footpath ; h ventilators 

 in front wall, regulated to admit or shut 

 out air from the area d; i descending 

 air cavity; £ ascending air cavity; x floor 

 of potting shed ; r cellar or root store ; 

 n passage to ditto, which is an open area, 

 except where an arch crosses, forming 

 entrance to potting shed % ; o boiler ; 

 p surface of the border." 



References to ground-plan : a a hot- 

 air chamber ; b b area for vines ; c c c c c 

 register gratings, to regulate air to hot- 

 air chamber ; d tank for water from the 

 roof ; e stoke-hole. 



Bicton pine-stove — fig. 453. This struc- 

 ture, erected by Mr Glendinning, of the 



Fig. 453. 



Chiswick nursery, is complete of its kind. 

 In some particulars it differs from those 

 in general use ; and those, we hesitate 

 not to say, are improvements — viz., the 

 perforated tube c, which is of copper, and 

 nearly parallel with, and immediately over, 

 the hot-water pipes in front. " This pipe 

 is attached to other pipes connected with 

 a main, which supplies some fountains. 

 There is a considerable pressure on this 

 perforated pipe, which is movable, the 



