Ix PESTS 183 
exposure to all wind. After a snow-drift, the least 
snow will be found in the most exposed places: the 
most where the wind is checked or just on one side 
of its full force. A stream in flood brings down much 
light matter, and deposits it anywhere that it can 
reach, except just in the strongest current. 
Draughts should be avoided: places where the 
wind comes round a corner or even through an open 
door are often the first to be attacked. And another 
point is just what we should recommend to a human 
body exposed to disease-germs: keep up the con- 
stitution and general health and hardiness as much 
as possible. Avoid drought by hoeing rather than 
watering if practicable: see to the food supply, and 
avoid unhealthy conditions. 
Certain Roses are peculiarly susceptible to mildew, 
Her Majesty, for instance. It is a good plan to grow 
these among the Teas, or, better still, by themselves, 
where they will not, in the early part of the season, 
do so much harm by infection. 
For remedial measures, keep the sharpest look-out 
when mid-June arrives, or even before, for the first 
spots. Search them out, and attack them all above 
and below with finger and thumb, powder distri- 
butor, or syringe. Sulphur alone is good enough, 
especially if accompanied by gentle abrasion of the 
mycelium, if it reaches every part, the under as well 
as the upper side of the leaves, for it is, I believe, 
the destroying agent, whatever mixture or specific is 
used. 
For Roses under glass preventive measures will 
consist of great care in the ventilation. One year, 
by way of experiment, I never opened the venti- 
lators at all for my Maréchal Niel, and it bloomed 
