102 
stomata immediately, at least in some plants, although they may 
subsequently open again, as is indicated sf the fact that the 
transpiration curve suddenly rises shortly after the exposure of 
plants to gases, after which transpiration or the exhalation of 
as aphis, as fumigation is ea tly more effective in a moi 
StL than i ina ay 
oie in mind in fumigation 
is - it siguld be done ae a night and not in the daytime 
most important factor in developing resistant tissue. There is 
plant hasobee outa bees Laas or oni) in its nature 
has a b ‘umiga- 
aoe will Getee dae injury ape boght pens cloucy: weather, 
wo OF y pe rio 
By that time the plants will have an opportunity to harden up. 
