126 THE CULTURE 05" THE GRAPE. 



and prevent too great an accumulation of it ; the "person 

 having charge will soon, by attention, ascertain how 

 much ventilation is required under such circumstances. 



It will be preferable to have a low temperature, and 

 changing between sixty-five and eighty, than by having 

 the house closed, the heat raised, for even a very short 

 time, to one hundred, or one hiindred and twenty, which 

 would be the case in changeable weather, should the sun 

 shine forth suddenly, and the house be entirely closed. 

 This must never be allowed, but, as soon as there is a 

 prospect of the sun shining, open the lights a little, and 

 continue opening as the heat increases. 



Avoid sudden changes of the temperature as much as 

 possible, and the air should, at all times, be admitted 

 gradually.* 



* In regulating the temperature of the grapery, care should be had to 

 prevent the too great accumulation of heat from the sun ; to avoid this, the 

 windows, or the ventilators, must be opened a little as soon as the heat 

 begins to increase, and thus, little by little, as the mercury rises ; by this 

 method, your vines will not be exposed to the injurious effects of sudden 

 changes, as would be the case, if you allowed the windows and doors to 

 remain closed until the sun shone full and strong upon it; in such manage- 

 ment, upon admitting air, the temperature would be lowered in consequence, 

 which, with an increasing of the sun's rays, would be highly improper, and 

 should never be allowed. Some sudden change may render this rise of 

 temperature, in a degree, unavoidable; if this should occur, air must bo 

 allowed to enter at once, in sufBcient quantity to prevent any further 

 accumulation of it. 



In a grapery without artificial "lieat, it is best to accustom the vines to a 

 plenty of air, and a temperature somewhat in consonance with that without. 

 Should you, in bright and fine weather, use them to a very high 

 temperature, the vine would be made to require this, and, at the time of 

 ripening of the fruit, when the climate is always cooler, should the weather 

 be cloudy, or otherwise unpropitious, you would have no means at command 

 to raise the temperature, and the consequence would be a loss of part of 

 the fruit by shrivel and shanking. 



