
18 
becomes coated with a creamy-white covering of conidia. 
Many crowded radiating growths of threads appear, spherical 
in form, and having a creamy-white color and velvety surface. 
In five or six days the velvety pile collapses gradually, and 
from three to fifteen cylindrical processes are produced in its 
place. These present a color more intensely creamy than the 
balls from which they sprung. 
“—=w» = ‘They develop into long,  slen- 
| der, and usually clavate sporo- 
phores, generally simple, though 
sometimes branched. They oc- 
casionally reach the length of 
2.09 mm. 
YG ee 
Chinch-bugs, when attacked 
by this fungus, become uneasy, 
refuse to eat, and finally become 
quiet and die. Shortly after this 
the characteristic felted growth 
bearing the heads of conidia ap- 
pears on the outside. Fig. 9 
shows achinch-bug, greatly mag- 
nified, which has been killed by 
FIG.9. Diseased chinch-bugs; en- the fungus. The fine thread-like 
larged specimen shows fungi penetra- growth on the outside is the 
ting through skin and covering it;oth- : 
ers in natural size killed by thedis- mycelium of the fungus. 
ease. Original. 

PRODUCTION OF SPORES ON A LARGE SCALE. 
The propagation of the fungus was carried on in fruit jars on 
avery extensive scale. The two-quart Mason jar, first used by 
Prof. Forbes, having a zine cap lined with porcelain, is very 
convenient for this purpose. The porcelain lining of the screw 
cap is removed, and a short tube of tin, about one and one-half 
inches long and three-fourths of an inch in diameter, is soldered 
in the center of the cap (Fig. 10, Plate I). This tube holds the 
plug of cotton with which the jar is closed. When the jar is 
ready to be charged the cap is removed and the jar about one- 
fourth filled with a mixture of corn-meal and beef broth, made 
by boiling beef in water until most of the nutrimentis extracted. 
