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 Eoses 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 Eoses 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 Marechal Niel, and it bloomed 



