17 
terest, and may serve likewise as a partial check on conclusions 
awn from the discussion of the injury to corn. The grass injury 
is, however, relatively so light that only the five lesser grades 
n be used, even for Southern Illinois. 
Table V. 
'uthern Illinois, 191 Towns. Injury to Grass, 1887, compared 
with Crop Areas for the Same Year. 
Degree of Injury. 
No. of 
Tps. 
Wheat. 
Barley. 
Bye. 
Oats. • 
Corn. 
Grass. 
27 
3,693 
4 
7 
1,601 
2,965 
3,308 
:le. 
63 
3,201 
2 
18 
1,776 
2,'689 
2,813 
ieraie . 
45 
2,450 
1 
19 
1,804 
2,536 
2, 504 
isiderable. 
46 
2,631 
1 
22 
2,185 
2; 870 
3,110 
at. 
5 
3,742 
4,369 
2,688 
35 
2,265 
2, 986 
2,084 
3,091 
4,112 
3,913 
2,'477 
3,405 
3,225 
v great . 
3 
87 
trly complete. 
2 
6 
tn that region there was no recognizable increase of the wheat 
?a with the increase of injury to meadows and pastures, but 
3re was a distinct enlargement of the area of oats, from 1,601 
:es where the grass injury was “nothing” to 2,265 where it was 
ery great.” Corn, on the other hand, neither rises nor falls, 
t the grass itself falls from 3,308 to 2,477 acres per township— 
ereasing, that is, in about the same ratio as that in which the 
;s increase. If we may draw any inference from these figures, 
must be that when chinch bugs are excessively numerous, grass 
Lds adjoining oats are especially liable to injury, and that this 
mage is consequently greatest where oats fields are most common, 
is entirely possible that, in this increasing oats acreage, we see 
Lected the facts observed in the field with respect to the spring 
ceding of chinch bugs in oats in this worst infested region,— 
s crop taking the place of wheat, in part, as food for the first 
lerat-ion. It is also possible that the amount of wheat grown has 
influence, but that this is masked by the greater effect of differ- 
*,es in the other crop. 
Table VI. 
itral Illinois, 397 Towns. Injury to Grass, 1887, compared 
with Crop Areas for the Same Year. 
Degree of Injury. 
No. 
of Tps. 
Wheat. 
Barley. 
Bye. 
Oats. 
Corn. 
Grass. 
£ 
319 
1,620 
1 
83 
2,575 
5,507 
5,825 
e. 
58 
2,113 
2 
42 
1,951 
4,139 
4, 9(H) 
prate. 
12 
1,960 
30 
1 680 
3 7Q2 
5 199 
•iderable. 
8 
3,523 
35 
1,924 
5,270 
6,432 
n the central part of the State where we are limited to de¬ 
es s of injury not higher than “considerable,” and where, it is 
S. E.—2a 
\ 
