DISEASES. 147 
that the main preventive of mildew is to keep the planta 
in a steady and healthy action, not only by supplying a 
due proportion of food moisture and heat according to their 
constitutional requirements, but by preventing sudden 
changes in the atmosphere with which they are sur- 
rounded, and particularly avoiding vold drafts in the lower 
parts of the house. Heat accelerates the circulation, and 
if the whole bulk of the air is uniformly heated, the cireu- 
lation will be equal in its action and distribution in every 
part of the plant. 
In our practice, bottom air is not admitted until the fruit 
hegins to change color. Although the above remarks may 
not harmonize with the opinions of others, an extensive 
experience has convinced us of their correctness. 
We have then the whole matter in a “nutshell.” 
During the time when the vines are growing freely, keep 
up a strong steady heat, avoid damp or cold and 
and east winds during cloudy weather or storms; 
keep the house closed in such cases 
Be careful that the house is — suddenly heated up 
when the sun breaks out, afterward regulate the moisture 
os ge 
eats rah to counteract the efiects of sudden changes 
in the atmosphere is the great desideratum. The best of 
us may sometimes find our utmest skill tested, but a per- 
severance in the course here marked out with elcse 
attention will overcome all difficulties, and we will te 
amply repaid for all our trouble. 
my think that when mildew makes its appearance 
sulphur is the only antidote, without anything further than 
