y8 THE CULTURE OF THE GRAPE. 



the vine, as compared with that in which the .ops are 

 sitiiated, may not this be avoided by having a lower tem- 

 perature in the grapery, particularly in the night ? I 

 have, for many years, thought that this evil was often 

 caused by too great heat, followed by too low a temper- 

 ature. I can, at any time, cause these trouble in the 

 forcing-house to appear, but am not always able to avoid 

 them A grapery without artificial heat is more subject 

 to shanking than the forcing-house, notwithstanding the 

 temperature of the earth, at the season of the year when 

 such a house is liable to the attacks of this disease, is 

 much higher, and the roots of the vine are enjoying a 

 temperature relatively to the tops almost correspondent 

 with vines in open culture. 



I have observed that, in a house where there was no 

 means of warming it by fires, the crop of fruit has suf 

 fered most when, after a continuance of hot, bright, and 

 dry weather, in August, or early in September, we have 

 had a succession of cold, dark, and rainy days. In this 

 case, the cause is, apparently, too low a temperature at 

 the top of the plant, causing stagnation of the sap. A 

 brisk heat from a fine, or any other artificial means that 

 will give a free circulation to the air throughout the 

 house, and raise it to a temperature near which it has 

 been during the hot weather, will prevent its spread. 

 The cold rain will have reduced the temperature at the 

 roots of the vine, but in a much less degree than that to 

 which the tops have been exposed, so that now the tops 

 are relatively to the roots in a proportionately cooler at- 

 mosphere than during the hot weather. It does not ap- 



