6 Grape Culture. 



VENTILATION. 



Another essential feature is the ventilation. No matter 

 what the size or the shape may be, a vinery should have full 

 ventilation, top and bottom, with means of controlling the 

 inflow and outflow. Both bottom and top ventilation should 

 extend continuously from end to end. In the front, the 

 opening sashes should be hinged at the top to open outwards, 

 that the cold air may impinge on the hot pipes. When the 

 sashes are on centre points the cold air gets in at the top and 

 bottom simultaneously, which may injuriously affect the 

 lower portion of the vine, especially when the house is an early 

 one. Similarly the top ventilation should be hinged at the 

 top to open i inch or I foot as may be required. This should 

 be done both top and bottom by suitable gearing worked by 

 a wheel or lever, and should be very substantial and net easily 

 put out of order. 



TRELLIS. 



The wiring of vineries has developed in the direction of the 

 wires being kept further and further away from the glass. 

 Forty years ago the ordinary distance was 10 to 14 inches ; 

 later, this was increased to 16 inches ; now, many of the best 

 gardeners prefer to have the wiring 24 to 30 inches from the 

 glass, the reason given being that the vine leaves are less apt 

 to get scorched or chilled with the increased distance between 

 the glass and the leaves. The wires themselves should be not 

 more than 10 to 12 inches apart, and must be supported 

 below each rafter by light iron bars. 



EARLY VINERY. 



If for early forcing, a vinery 18 feet wide would require 

 liberal heating power. There should certainly be not less than 

 about I foot of 4-inch pipe to every 25 cubic feet of space. 

 This would give eight rows from end to end, and they would be 

 best placed six rows in front and two rows next the passage. 

 In exposed situations a larger allowance of pipe should be made 

 six rows at the front and four rows next the passage would 

 not be too much. It is the worst economy possible to have too 



