25 
DIAGRAM II. 
outhern Illinois , 191 Towns , 1887. Average Acreage in Grass ( A ) emcf 
Oa/s (R) corresponding lo Grades of Injury to all Crops. 
0 
1 
2 
3 
4 
5 
6 7 £ 
9 10 
11 
12 
13 
14 
15 
16 
17 
18 
19 
20 
4000 
3900 
• 
3800 
3700 
3600 
3500 
3400 
3300 
3200 
3100 
A 
3000 
2900 
B 
2800 
2700 
2600 
2500 
2400 
2300 
2200 
2100 
2000 
• 
1900 
. 
1800 
V 
1700 
1000 
1500 
r 
A 
1400 
I 
w 
1300 
\ 
v 
1200 
, '7 II / 
^ i\ f 
V 
1100 
1000 
