i] moi | 10.00 15.00] 20.00| 50.00] 60.00] 70.00 
Average height | 6.20) 7.5 | ro. 
jeacth ot eae: 
i 
2 | 13.00] 17.50] 21.2 
i d +2 45 5.2 50] 7-5 2 
| 1 1.3 1.7 2.2 0 4.01 3.2 
A ge di i 30 3 4 
idth of leaf....1 6.251 39.5 | 67.5 
sets the same exposure to gas it was found that in Series 1 and 2 
there was no burning; Series 3 showed slight burning; while in 
ed hi 
e. 
ese results show very clearly how different conditions with 
respect to such ee as light and moisture may very decidedly 
influence t of a plant or of such individual organs 
ion 
which plants develop, or under which different organs such as 
leaves develop, are of decided influence in determining the sus- 
seaehihy of the plant or the organ. 
Another point of considerable importance is the particular 
degree ne ae yofa plant a t the time of Saas gation. The 
particular plant to its activity. 
r this reason ae and florists have for some time held 
mi 
tc., on th ers has 
studied by investigators who have found that sunlight, cloudy 
weather, moonlight, drops of water remaining on the foliage, 
