THE GRAPE VINE. 95 



be moderately moist. After vines have borne a few 

 full crops in borders, manure-water may be freely used 

 in a moderately strong state, always avoiding rank 

 doses of any preparation. Sheep, deer, and cow manure, 

 and guano, make excellent manure-water for vines. 



Ventilation. — Air should be admitted daily from the 

 time the vinery is shut up for forcing. This is neces- 

 sary for the double purpose of changing the atmo- 

 sphere, and preventing its rising above the maximum 

 temperature. When the air is cold and frosty, as it 

 frequently is early in the season, it should be admitted 

 in small quantities at a good many points. Large 

 volumes of air admitted at a few places cause violent 

 cold currents, which are undesirable, and hurtful to 

 the tender foliage. As the vines advance into leaf, 

 and the sun gets strong, give a little air early in the 

 morning to allow the moisture that may be about the 

 foliage to escape before the sun comes fully on the 

 house. The amount of air should be increased by 

 degrees till the sun is in meridian, and again reduced 

 as the sun declines. Unless in exceptionally stormy 

 or cold weather, a little air should be left on all night. 

 This is especially necessary in these days of large 

 close-lapped panes of glass. When the grapes are 

 colouring, give more air than at any previous stage ; 

 and when quite ripe, let a constant and more bountiful 

 supply of air circulate about them. 



It frequently occurs that vineries have to be erected 

 against existing garden - walls ; and in cases where 

 these walls are too low to give the proper pitch to the 

 roof, a good plan is to raise them with mullions and 

 sashes, corresponding exactly with the front ventilat- 

 ing lights, the only difference being that the back 

 lights are hinged at the bottom, and open from the 



