310 CULTURE OF THE GRAPE. 



be put to a double, or a winter and summer use, with the 

 best and most economical results. Yet this culture re- 

 quirks constant and long-continued care; and it should 

 not be undertaken except with a determination to grant 

 every requisite, and allow no neglect. 



DISEASES. 



We "have given an extended view of this subject in 

 treating of open-air culture ; and the rules there given 

 will, in general, apply with equal force hi the grapery. 

 In the latter case we have such control of conditions, that 

 it is comparatively easy to banish all diseases. 



We can avoid sudden changes of temperature, or cold 

 bottom-draughts, or dampness, which are the causes or 

 conditions of mildew. We can also apply the remedies 

 more effectually : we can pervade the house with a smell 

 of sulphur (never burning it), and thus defy mildew and 

 red-spider; we can fumigate with tobacco-smoke, which 

 is a sovereign remedy against most other insects. Where 

 there is a liability to the attack of the mealy-bug, or 

 scale, it is best to make a wash, of the thickness of cream, 

 of the following ingredients : Half a pound of whale-oil 

 soap, four pounds of sulphur, and one ounce of nux vomi- 



