6 



THE FORCING GARDEN. 



which they are heated to a good growing temperature. 

 The grapes swell, but do not often colour well, especi- 

 ally the very early ones, and the reason is given 

 above. 



FIG. 2. SECTION- OF TOP VENTILATORS, TWO FEET SQUARE. 



Keference to ventilators. a a a a, openings in back wall of house close under wall 

 plate at the top ; BBBB, shutter and sliding ventilators ; cc, the runs in which 

 the ventilators slide, by means of connecting wires, D D D ; and the cords and 

 pulleys, EEEE ; //; stops. The runs must be fixed on the wall with stout hooks, 

 and the pulleys fixed firmly on the wall. All these shutters can be opened and 

 shut at once the whole length of the house. 



It is difficult ordinarily to get air enough into 

 very early graperies so as to colour the fruit. Houses 

 for the early forcing of vines are not constructed for the 

 safe admission of air in a sufficient quantity to colour 



FIG. 3. SECTION OF FRONT AIR SLIDING SHUTTERS FOR AN EARLY FORCING HOUSE 

 AND VINERY. 



Reference. a a a a, openings, one foot square, in front wall, as shown in sectional 

 plan of vinery (fig. 4), at ' B.' These openings may be four feet apart, or less. 

 B B B B B B B, sliding shutters, opened and shut all at once by the cords and 

 pu leys, cc. As these shutters are fixed so low, the cords work upwards instead of 

 pulling downwards, as in the case of the ventilators at the top of the house. They 

 may be outside. 



the fruit well. The roofs are too flat for a brisk cir- 

 culation, when it can be admitted, which is not often. 

 It will be seen in fig. 4 what my plan is for meeting 



