134 
have any connection with that distributed August 7 and Septem¬ 
ber 5, since the disease was found more or less prevalent in all 
fields visited in this neighborhood at this time. As the white 
muscardine did not spread from the centers where the infection 
was introduced, and as the chinch bug hosts continually increased, 
remaining in a vigorous and perfectly healthy condition in its 
very midst, the experiment is regarded as a complete failure. 
This description should be read, however, in connection with 
that given under No. 7fi, relating to a considerable outbreak of 
chinch-bug muscardine on a farm immediately adjoining this on 
the north. 
No. 75. This is a farmer’s field infection experiment made by 
Mr. Frank H. Robinson on his farm (the right hand third of 
Plate IV.), about two miles north of Odin. August 7, several 
pieces of culture material containing a profuse growth of the 
white fungus, from No. 2, were placed in Mr. Robinson's hands by 
Messrs. Marten and Johnson, and directions given for its distri¬ 
bution. August 8, two small plats of corn, represented on Plate 
IV., at C and D, thickly covered with chinch-bugs, were chosen, 
and the infection material scattered along the north side next the 
orchard, behind the leaves and on the ground at the bases of the 
stalks where the insects were most abundant. 
September 5, examined by Mr. Johnson. Corn all dead in plat 
represented at D. Chinch-bugs still very abundant on the dead 
brown stalks and leaves. No traces of the infection material 
found, and only two bugs dead with this fungus were seen; and 
these were taken from under a clod on the ground, which was 
very wet from recent heavy rains. About the same condition 
was noted in plat C, except that a few traces of the old culture 
material still remained on the ground at the bases of a few stalks, 
and that no fungus-covered bugs were seen. Chinch-bugs were 
present in small numbers in all the meadows bordering the field 
containing this corn. In a twenty-two acre field north of the 
house, represented at E, the corn was completely destroyed by 
their attacks, and nothing green remained. The bugs were every¬ 
where abundant, and almost completely covered the ground in 
many places, but there were no traces of fungous disease. Grass 
in the meadow adjoining on the south was slightly damaged. 
September 19, a few live bugs, mostly adults and pupae, were 
seen in the stubble at C and D, but no traces of Sporotrichum 
were found. The insects were still present in the surrounding 
meadows. The corn ground (E) had been planted in wheat, and 
only a few bugs remained in the field. The attack had greatly 
increased in the meadow to the south, and considerable grass had 
been killed. No traces of the white fungus seen on this place at 
this time, September 26 and October 6, similar report made by 
Mr. Johnson, except that a few fungus-covered bugs were found 
in the meadow south of E on the latter date. The experiment is 
classed with 73 and 74 as a total failure. 
This description should be read, however, in connection with 
that given under 76, relating to a considerable outbreak of chinch- 
bug muscardine on a farm immediately adjoining this on the west 
