PINERIES. 



345 



a flow-pipe, for top heat; b return do. do. ; face line of soil ; i oak leaves; h raised 

 c boiler ; d bottom-heat pipes ; e e venti- path, paved ; I ground line, 

 lators ; /back sashes, fastened to the ridge Fig. 464 represents the fruiting pine- 

 with hinges; g light cast-iron columns, stove at Poltalloch, which is, in all its 

 1 2 feet asunder, to support ridge ; h sur- details, exactly similar to the melon and 



Fig. 464. 



cucumber houses described in their pro- 

 per place, as existing in the same estab- 

 lishment ; only, in this case, the width 

 and height are increased. The following 

 reference to the figures in our section will 

 more fully explain the principle : a a bed 

 in which the fruiting plants are either 

 planted out in the soil or grown in pots 

 and plunged in gravel or other porous 

 material ; b b Caithness pavement, form- 

 ing the bottom of the bed, supported on 

 the 10-inch brick piers g and I, and also 

 let into the side walls atm;cc the vaults 

 under the beds ; d d the flow hot-water 

 pipes ; e e the flow surface-pipe for heat- 

 ing the atmosphere; //the return pipes; 

 g g 10-inch piers for supporting the 

 centre of the beds; hhh h 10-inch piers 

 for supporting the hot- water pipes; i i 

 upright tubes set in pavement to regulate 

 the bottom heat, by allowing it to ascend 

 into the house when too strong below; 

 k k polished Caithness pavement, 3 inches 

 thick, set on edge, forming the sides of 

 the passages, vaults, and beds ; n tubular 



VOL. I. 



air-drains showing the nozzles through 

 which the air escapes into the air-cham- 

 ber under the passage, and is admitted 

 into the house by ornamental iron grat- 

 ings set in the floor pavement at equal 

 distances ; o o tubular air-drains in 

 centre of cross partition walls, giving out 

 air through the bent pipes p p. The 

 section shows the mode of bottom venti- 

 lation employed not only in the fruiting 

 pine-house, but in those for succession 

 and younger pines, and for melons and 

 cucumbers also. The internal arrange- 

 ments of all are the same, excepting that 

 in the latter they are not so lofty ; the 

 rise of the roof will be seen at t. q q 

 show the position of the air-tubes in 

 passing under the doorways, after which 

 they rise up to the level of the beds. 

 Two ventilators, each 2 feet square, are 

 placed in the front or end of each house, 

 and have been already noticed ; rain- 

 water tanks, supplied from the roof, and 

 brought down from the gutters at the 

 end next the back wall in 3-inch leaden 



2 x 



