24 Contagious Diseases of the Chinch-bug. 
ently healthy. Hardly as many with white growth. Earth in 
pot moister than in A. Pot freshly moistened. 
November 16— Pot D, wet: Number of living bugs appar- 
ently greater than in C, and mould-covered bugs fewer if dif- 
ferent. Pot freshly moistened. 
November 16— Pot E, dry: Bugs apparently all dead; some 
with mould covering. 
December 5—Pot D, wet: No live bugs seen. Contents of 
pot dry. Several dead bugs with no external growth. Pot not 
moistened further. 
December 5—Pot A: No live bugs seen. Pot dry. Major- 
ity with white growth. Pot not watered again. 
December 5—Pot C: Same as A. Some live bugs found in 
wet pots as late as November 22. 
It will be noticed that the checks remained pure in experi- 
ments 4, 6, and 11, the bugs dying in the inoculated pots of 
Sporotrichum, while in all the other experiments the checks 
showed as good growth of Sporotrichum as the inoculated pots. 
Experiment 23 showed the anomalous result that two of the 
three checks developed Sporotrichum, while inoculated pots 
were free from it. 
We may conclude from these experiments that Sporotrichum 
was pretty generally prevalent throughout the state, and that 
probably in many localities there was no necessity for its arti- 
ficial distribution in 1895. 
How much this general presence of Sporotrichum was due 
to its distribution by the Station in former years it would be 
impossible to say. 
Experiment 26. Open-box experiment in the laboratory. This 
experiment was made under different conditions from the fore- 
going, and is not given in the series in the order of its date. 
Wooden boxes were used instead of flower-pots. The boxes 
were left uncovered, so as to give conditions more nearly like 
those in the open field. The bugs were kept from escaping 
from boxes by means of a heavy chalk-line drawn inside the 
box on the sides. Box 2 was very shallow, and the bugs were 
kept in it by means of a tar-line on the soil of the outer edge. 
The bugs for the boxes were taken from a field which had been 
artificially infected in 1894 and 1895. We wanted among other 
