No. 401.] THE FRUITING OF THE BLUE FLAG. 383 
by the study of localities 6 and 7, in which cold water and 
consequent late flowering are accompanied by nearly total 
infertility. While various reasons might be assigned for this 
advantage, I am inclined to believe that the principal reason 
is the coincidence of the visits of the bees, pollen distribu- 
ters par excellence, with the time of blossoming of the early 
flowers. 
The following table expresses in general terms the relation 
which ravage by insect enemies was seen to bear to situation. 
The first three columns express broadly the more potent fea- 
tures of the several situations. In six columns are indicated, 
by abbreviations of their respective scientific names, the six 
chief insect enemies: Mononychus, Penthina, Mamestra, Arsi- 
lonche, Orthoptera (grasshoppers), and Cheetopsis ; the numbers 
in these columns merely indicate the relative destructiveness of 
the insects named for each locality. In the last column is 
given the percentage of injury done by the species that was 
most destructive in each locality. 
TABLE III. — RELATION OF INSECT RAVAGE TO IRIs HABITAT. 
WATER. Insect ENEMIES. * E > 
g EXPOSURE TO SUN. : ; : ; ii. 
P A t Temperature. š š Š [T a X be 
mount. S È S < è S AS 
1 || Open 6 inches) Warm 11411 2 10 
2 n 1-6 * y a413iris14105]. 3 
3 “ 4 &« & 21472 6/2 5 40 
£u 6 * " 3/41/1121 5] 6]| 6 
5 || Overtopping sedges || Wet soil 5|6|2|3|1|4]| 6 
6 || Deeply shaded o-20 inches| Cold I ; 45 
7 || Open o-4 “ |Cold(spring)| 1|4 | 3 215]| 50 
8 S Moist soil I || 100 
So the blue flag is growing in certain native habitats now, 
under altered conditions, apparently not normal to it, in which 
it meets with enemies against which it is not fitted to cope. 
