THE PINK COEN-WOEM. 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 sm.all 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 be^n 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 liquid 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 light of any kind is 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 adjoining 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. 



