15 



injury are available, since but tliree towns reported damage to com 

 as more than considerable. On the other hand, the wheat acreage, 

 including both spring and winter varieties, does not reach 350 

 acres per township in any of the groups, nor fall as low as 320. 

 Evidence as to the [connection between wheat culture and chinch- 

 bug injury can be expected here only as a result of close obser- 

 vation, in small neighborhoods; and such evidence for Northern 

 Illinois will be presented under another head. 



Here, also, the tables for subdivisions (northwestern and north- 

 eastern Illinois) agree in general with those from the larger. table 

 including both.* 



Table IV. 



The Whole State, 812 Towns. Injury to Corn, 1S87, compared 

 with Crop Areas for the Same Year. 



Degree of Injury. 



No. of 

 Tps. 



Wheat. 



Barley. 



Eye. 



Oats. 



Corn. 



Grass. 



















None 



395 



' 956 



57 



200 



2,873 



5,302 



6,768 



Little 



123 



1,431 



65 



193 



2, 633 



4,888 



6,367 



Moderate 



25 



1,520 



57 



153 



2,149 



4,060 



5,685 



Considerable 



56 



1,856 



47 



83 



1,735 



3, 538 



4,809 



Great 



34 



2, 968 



2 



40 



1,610 



3,163 



3,800 





52 



2,380 



1 



22 



1,51 



2, 814 



3, 151 



Nearly complete 



98 



2,s<77 



3 



23 



2,124 



3,067 



3,532 



Comi)leie 



29 



4,329 



1 



2» 



2,726 



3,298 



3,273 



Combining now the facts derived from the whole State in one gen- 

 eral table setting forth the relations of the acreage of the principal 

 farm crops to chinch-bug injury to corn for the year 1887, we notice 

 first the greater value to be assigned to the averages presented by 

 this table, and the greater weight to be attached to its results, 

 due to the greater area covered by it, and the more numerous ob- 

 servations which it summarizes. Representing reports from 812 

 towns, and no group including less than 25, we must consider this 

 table as of much higher authority than the preceding ones. 



Its showings, however, are not essentially different from those 

 already set forth, amounting, in fact, to a combination of those 

 from the first two of our series. The wheat numbers increase, 

 with only one unimportant break, from 956 acres per township 

 where the corn was not injured to 4,329 where it was completely 

 destroyed, the successive steps of increase thus averaging about 

 fifty per cent, of the lowest number. The column of figures for 

 each of the other crops presents us, on the other hand, with a 

 mixed series, descending uniformly to the grade of injury marked 

 as "very great," and then ascending by two steps to the end, — 

 clearly a repetition on a larger scale of the facts exhibited by the 

 separate tables for Central and Southern Illinois. The southern 



♦The only exception to this statement is shown by the spring-wheat series for Northwestern 

 Illinois. Taking that alone, we have a noticeable increase from 326 acres per township to 411, cor- 

 responding to a damage to corn ranging from "none" to "considerable." 



