THE GRAPE HOUSE. 7 
the case. This house is on a scale of one-sixteenth of 
an inch to a foot, and at an angle of 45°. 
These bottom openings in the front wall can be 
safely left open almost constantly durirg the ripening 
of the grapes in cases of early forcing, for no chilly air 
can come to the tender growth of the vine. The air 
coming in direct contact with the hot pipes gets 
warmed, made lighter, and quickened. The heat of 
the pipes gives vitality to the air which is admitted ; 
it ascends with rapidity to the frait and branches, 
Fic, 4.—END SECTION. 
Scale 3,th inch to 1 foot. 
and, there being a constant and fresh supply from the 
outside, it is well supplied with colouring matter, 
oxygen, which must be admitted or the grapes cannot 
possibly colour. The more of this you can safely admit 
combined with heat, the deeper will be the colour of 
the fruit, and the sweeter also. F, pit, 5 feet wide, the 
whole length of the house, to be filled with some 
fermenting material, such as leaves, stable manure, «&c., 
to cause a damp and warm heat, which will materially 
facilitate the development of the vines and the fruit, in 
its first stage. § (fig. 4), root protection lights over the 
border, to be used through the winter and cold spring 
