HOUSES AND CONVENIENCES. 19 
nothing more than can be guarded against by clos.ng up 
If there is any preference for general utility, the curve 
line double a ought to be chosen, as from the convex 
exposed to the sun’s rays, at whatever 
altitude he may ni the intense heat is somew seat 
tered, there is less danger of the leaves being scorched, 
and the Bight} is also more equally distributed; this form 
is also generally considered the most agreeable to the eye. 
Whatever style of double pitch be adopted, the ends 
ought to face north and south, or as near these points as 
may be convenient,—although a few degrees, variation 
either way is not of much consequence. By placing the 
house in this position, both sides receive the influence of 
the sun equally ; besides in the middle of the day, when 
his rays are most intense, they are partly warded off by 
striking obliquely upon the sash-bars above, which on the 
whole length of the house, acts as a considerable shade. 
In some cases, it may be desirable to cover a dead wall 
or side of a building; or it may be requisite that the cold 
grapery should be connected with a line of early forcing, 
or plant houses, when the lean-to roof will be most con- 
venient, but there is no other advantage in adopting 
it, for with a double pitch, having two rows of pillars 
inside, one on each side of the central pathway, both 
sides may be planted, thus accommodating a double quan- 
tity of vines ; besides there is no back wall seen, and it 
shows better taste in the proprietor. Where the avoiding 
of expense is an =... considering 
Where 
