62 orchid-grower's manual. 



GLAZING OF ORCHID HOUSES. 



N the houses already referred to, the 21 oz. English 

 glass is used, being the best for the purpose 

 because not easily broken. The squares of glass 

 in the roof are two feet six inches long by nine inches in 

 breadth ; those in the upright sashes at the sides are fourteen 

 inches long by nine inches wide. The laps are very close. 

 We remember seeing an Orchid house much injured after a 

 hail-storm, a large portion of its valuable contents being 

 nearly spoiled ; in this instance the glass used was only 

 16 oz., whereas, if it had been 21 oz., it would most likely 

 have withstood the storm. We therefore recommend 21 oz. 

 glass, or even a heavier kind, as not being likely to get broken 

 by cleaning or otherwise. Too large squares are bad, as they 

 are apt to get broken by frost. The upright glass at the sides 

 ought to be of the size stated above, to correspond with that 

 in the roof and also in the ends and the door. The sash bars 

 should have a small groove down them to carry the condensed 

 moisture to the bottom, in order to prevent it from dripping 

 on to the plants. Or small pieces of zinc nailed to the bars 

 serve to form a sort of gutter to carry off this moisture, and 

 thus prevent drip, which is very injurious to the plants in 

 cold weather ; even when the weather is warm the 

 may be injured, and a deal of harm may be done by drip. 



HEATING ORCHID HOUSES. 



|0R effecting this, nothing is better than a hot-water 

 apparatus. We recommend four-inch pipes, and to 

 put in an excess of piping rather than too little. 

 There is nothing saved by economising the piping, and it is far 



