32 
was no sign of recovered life anywhere visible. Bowls, graduates, 
and Bisulfide were left with Mr. Taylor, and all the treated hills 
were marked for later examination and to note the effects of the 
chemical. The experiments were made in the middle of a very hot 
da3‘, the thermometer 93° in the shade, littleor no wind blowing, and 
the sand so hot that it burned through shoe soles and could scarcely 
be handled more than a few moments at a time. Many of the hills 
showed the edges of the leaves, when the covers removed, yellowed 
and set with numerous drops of a clear liquid. I feared permanent 
injury, but instructed Mr. Taylor if he found that the plants died to 
continue his work before the sun w as high or after it was quite low. 
He wrote me under date of July 19 : “The hills you treated when 
here last started to grow nicely, except the two hills where the Carbon 
was poured on the ground ; that killed them. The treated hills 
showed no lice at last examination.” I am quite satisfied from the 
experiments above recorded and from others that were not record- 
ed, but were simply made to settle practical questions, that in melon 
fields at least Bisulfide of Carbon can be used satisfactorily and ef- 
fectively. It has the enormous advantage ofreacliiug everything on 
all parts of the plant, not a specimen escaping. With a stock of 
from 50 to 100 light covering-boxes about 18 inches in diameter, as 
many shallow 7 dishes, and a bottle of Bisulfide, the infested hills in 
a field can be treated in a comparatively short time. 
The discussion that followed this paper brought out the virtues 
of Bisulfide of Carbon in a clear light. Mr. Davis reported its use in 
Michigan to destroy woodchucks. I’eas and beans exposed to the 
vapor for two hours were effectually rid of the “bugs” that infest 
them. Stored grain infested with weevil was cleared of the pest bv 
pouring over the surface an ounce of Bisulfide to 100 pounds of 
grain. Melon vines could be confined under a waslitub or any other 
close vessel, and get rid of lice, etc., in a few hours. When plants 
are small, a small vessel only 7 is required — something to confine the 
vapor. 
Mr. Southwick coincided with the author of the paper in the 
importance and value of prompt preventive measures, and stated 
that he was especially interested in the use of Bisulfide of Carbon, 
which he had employed in his work in Central Park since 1884. 
He referred to a new wash, a combination of Bisulfide with “poly- 
solve,” which he used in the form of an emulsion. He stated, 
however, that “polysolve” was no longer being manufactured, but 
thought its place might be taken by kerosene emulsion. 
-'-'T sin/l + ULns>^- 
