lay f 
THE PINK CORN-WORM. 17 
The pink corn-worm and associated insect pests which have been 
mentioned enter the seed of grain in the field, so that treatment is ‘ 
most effective if made as soon as possible after harvest. 
In the case of small quantities of seed a tight barrel may be used as 
a receptacle. One or two ounces of carbon bisulphid may be placed 
in a small saucer or pie tin upon the top of the grain and the top of 
the barrel covered with heavy cloths or oilcloth. 
In the fumigation of a large building at least two, and preferably 
three, men should assist in the operation. The building should be 
tightly closed and the pans or containers for the liquid distributed 
about the building. Then, as far as possible, the work should be 
begun in the lower parts of the building, working toward the top. 
After the cubic capacity of the building and of the separate rooms 
has been computed, the requisite quantity should be divided among 
the pans in each room, about one pan to each 100 square feet of floor 
space being used. After the hquid has been poured into the pan 
the room should be left at once and the other parts of the building 
treated in the same manner. While the gas is not immediately fatal, 
it is well not to inhale too much of it, since nausea and severe headache 
are likely to result. After the building has been treated in the manner 
mentioned, exit should be made promptly and the doors tightly 
closed. 
At the end of the period of exposure doors and windows should be 
opened wide so that the gas may escape. One or two hours should 
then elapse before work is resumed in the building. A slight odor 
may still linger in the poorly ventilated corners of rooms but there 
will be no danger to occupants from the gas, and the odor will gradu- 
ally disappear with ventilation. 
PRECAUTIONS. 
Particular attention must be called to the danger from fire due to 
the presence of carbon bisulphid in the air, and special reference 
should be made to it in connection with the treatment of buildings. 
The danger of bringing a lighted cigar or other lights, such as a 
lantern, into the presence of the gas must always be borne in mind, 
since in at least one case an explosion of considerable violence was 
caused by such carelessness. 
The application should always be made in daylight, as no arti- 
ficial hg¢ht of any kind 1s allowable. Even electric lights may not be 
used, since there is always danger from the sparks caused by turning 
them on and off. | Electric and other motors and steam pipes should 
be turned off, that no danger may result from the sparks or heat. 
Owners of adjoiming premises should be warned as to the charac- 
ter of the work that is being done and the need for care if vapor 
should penetrate their rooms to any extent. 
