ARTIFICIAL INFECTION—FIELD EXPERIMENTS. 39 
one place than in another, so far as could be seen. Harvest had 
begun before another visit was made, on July 12. The bugs had gone 
into some adjacent corn. Pupz were very thick on the ground about 
the base of the stalks, under bunches of crab grass and other vegeta- 
tion that afforded protection. Adults were emerging in large num- , 
bers. A few diseased bugs were found in the corn where the bugs 
were collected for molting. A pile of cut corn was made in the field 
and fungus scattered in it. A second pile was made and left unin- 
fected. On July 30 an inspection showed that diseased bugs were 
still scarce, only one being found. The infected and check piles of 
cut corn and the locality immediately adjacent showed no effects of 
the infection or shading. Both piles of corn contained thousands of 
molted skins of the bugs, which might have been taken by an un- 
skilled observer for dead bugs. 
Results of experiments in Anderson County—Conditions at Gar- 
nett and Colony were unique when compared with all the other 
places where experiments were made. Spontaneous outbreaks of 
Sporotrichum had been the rule, but at Garnett and Colony they 
were absent, or nearly so. To explain the situation, one would natu- 
rally examine the climatic conditions, since they probably have more 
to do with the propagation of Sporotrichum than any other factor. 
The following table gives some comparative data: 
May and June. 
Place. 
eae Me: 
Precipi- 
tation. | ‘emper- 
Inches. SEE: 
Gamethccccc-ceeeas 2 Siepeaicta tae Oe terete Aye 11.31 65.5 
pumers G@Zarsons) 22s ee ee ee 9. 61 68.0 
We Mis SCeee ema em clo wiah mimesis paces 12. 46 65.6 
Bae GWellinte tom) assee te res Tee Res 4.67 68.8 
GD ANON oe te aoe oA esa eee aatls 6.19 65.1 
erate (Thayer) Be DAY eas 13.69 65.5 
MMO epenGencekaace seen. eee peo 9,21 68.1 
Eten InSOneee es: See ey eee es ches 67.1 
Garnett had an abundance of moisture, but the spontaneous out- 
break was only slight. Conspicuous outbreaks occurred at Lebo and 
Thayer, where the precipitation was greater, at Parsons and Inde- 
pendence, where it was but a little less, and at Wellington and 
Lebanon, where the precipitation was much less. The mean tempera- 
ture for the two months was below normal, but not below the mean 
temperature of other places where spontaneous outbreaks occurred, 
for example, Lebanon and Thayer. It would seem, therefore, that 
the explanation of the fact that spontaneous outbreaks in Anderson 
County were so meager can not be found in the climatic condition, 
and must be attributed to some other factor. Was it due to a scarcity 
of fungus naturally present in the soil? This would seem to furnish 
