1880.) Destruction of Obnoxious Insects by Fungoid Growths. 631 
about twenty-four hours the yeast has become active as is shown 
by frothing and the budding of the Torule observed under. the 
microscope. This active yeast is sprinkled all over the plant, 
care being taken to wet the bodies of as many aphides as possi- 
ble. Over the plant is placed a bell jar to isolate it from others. 
April 11.— No effects noticed. Sowed more of the same 
veast. 
April 18.—The soil in the flower-pot has been allowed to 
become quite dry. The larger leaves of the plant have turned 
yellow, and upon these are nearly all the aphides. Counting as 
carefully as possible, the number is found to be three hundred 
and fourteen. The glass cover is removed and nearly all the 
aphides are brushed off, and the plant allowed a few days to 
recuperate. 
Experiment No. 5—May 1.—Sowed yeast procured direct from 
the bakery upon the same plant as in No. 4. Upon the piant are- 
fifty-five aphides, mostly small. The plant is placed in a close 
Wardian case where there is an abundance of moisture. 
ay 6—A mold (Mucor) has made its appearance upon all 
parts where the yeast adheres. The aphides are nearly all dead 
or dying. One aphis is found alive held ta the stem of the plant 
by a pasty mass of yeast. 
May 16.—Only three aphides alive; the mold has seriously 
injured the plant. 
Experiment No. 6.—May 26.—Sowed yeast from the same 
bakery as in No. 5 upon the aphides on a healthy young plant of 
Same kind and size as No. 4. This time the plant was not 
treated differently from others in the same room except being 
thoroughly sprinkled with yeast. 
June 3-—Aphides as numerous as ever. No dead ones seen. 
Experiment No. 7—To ascertain whether any fungoid growths 
could be developed from the dead aphides in No. 5, two of them 
are placed on a bit of clean, broken plant crock sufficiently moist- 
ened, which is covered with a small bell glass, the rim of which , 
rests in a shallow vessel of water to isolate the experiment as 
completely as possible. The experiment commences May 5, at 
2 P.M. On May 6, at 3.30 P. m., some mycelium is visible on the 
body of an aphis. 
May 9.— A number of upright hyphe have fruited; the 
quantity of fruit is very small and not sufficient to determine 
what the mold is with certainty, but it appears to. be a Mucor. 
