HOUSES AND CONVENIENCES. 27 
if we always gave ear to her instructions—the sun's rays 
strike the earth, and produce the greatest heat at the sur- 
face. She has no fived confining canopy over the plants 
under her charge to prevent the heat from passing up- 
ward, and if we are obliged to have such, we ought not 
to render our tural than there is ocea- 
sion for. Keep the head cool and the feet warm, is ad 
vice often given by our physicians, and the same rule 
applies to plants generally, with very slight modifications. 
If the roof be made with sashes to slide over each other, 
which is the method best adapted for removal of the 
house at any future time, the upper ones will becomethe vag 
ventilators; but when it is fixed, —_ en - a co’ 
row of sash b 
the openings require to be lifted up from the bottom, and 
hung onthe opposite end by hinges, or suspended by the 
middle on each side, and opened on a pivot. When hung 
by hinges the sides may rest upon the rafters, and the 
lower end project a little over the next squares of glass. 
thereby making it proof against drip, and this is perhaps 
the best plan, for beside being safer against rain, air can 
be admitted and the temperature lowered, without cold 
draughts s striking down into the house. If hung from the 
sides there are no effectual means of capping, and however 
_ good the joints may be, the rain will find its way through 
more or less in time of violent storms. 
The internal fixings required, are wires to support 
