10 



ORCHIDS. 



brickwork on wliicli the table rests ; and there should 

 be an open tank in the centre, vdth means for turning off 

 the water when moisture is not required. Small iron ven- 

 tilators, made to open and shut, should be inserted in the 

 brickwork on each side, so as to allow the heat and mois- 

 ture to pass into the house when required. At each end 

 of the middle tables there should be a hole, provided with 

 a sliding door, large enough for a man to enter under the 

 tables, to examine the pipes at any time when they are 

 out of order. 



Glazing. 



The laps here are close. The squares are 3 feet long 

 and 11 inches vdde, sheet glass, 21 oz. to the foot. On 

 both sides there should be upright sashes, containing glass 

 15 inches high and 11 inches wide. The south end of 

 Mr. Warner's house is glazed, and the north end is brick- 

 work, for climbing Ferns and Orchids. Each sash-bar of 

 the roof should have a small groove in it, to allow the 

 -water to run down to the bottom of the bar, where a small 

 zinc gutter should be provided to receive it; if this be 

 not attended to, the latter will drip on the plants, which 

 is very injurious to them. 



Ventilation. 



This is of great importance ; for if cold air is allowed 

 to pass among the plants they will not thrive, and all care 

 which has previously been bestowed on them will be in 

 vain. Means of ventilation should, therefore, be pro\dded 

 for, near the ground, close to the hot-water pipes, in order 

 that the air may be warmed in entering the house. In 

 the houses here there are three ventilators on each side of 

 each house, two at the south end in the brickwork, and 



