288 THE FORCING GARDEN. 



rally be four stripes or rows of panes in the sash ; 

 and if the lights are not all made moveable, at least 

 every alternate one should move *. 



Of Glazing and Painting. 



Crown-glass only should be used in hot-houses, as 

 being capable of admitting more light than green 

 glass. I was formerly of opinion, that the laps in 

 glazing'should not be puttied up ; but since contriving 

 the ventilators, as described above, I have altered 

 that opinion, and would advise that they be filled 

 with blue or black putty. It is a great saving in 

 the breaking of glass ; and also of fuel, in stormy 

 weather. The laps should not be more than a quar- 

 ter of an inch in breadth ; and the glazier should be 

 careful to fit the panes to each other, not reversing 

 the bends ; by which they are less liable to break, 

 than when laid in accidentally, some round, and 

 others hollow. 



Every part of the framing of hot-houses should be 

 well painted, and kept so. They should never be 



* On account of the high price of timber, some are now 

 constructing the framing of hot-houses of cast-iron. I would 

 beg leave to remind such, that there is nothing so prejudicial to 

 vegetation as the dripping of rusted iron ; and would advise, 

 that the frames be well painted, and frequently painted, in order 

 to prevent the bad effects of irony water falling on the foliage 

 and fruit. I am of opinion, however, that iron-framed hot- 

 houses will soon get out of fashion. From the quantity of water 

 that must be used, in order to keep the plants in health, the 

 frames must be often moistened, and mill corrode. 



