;l 



INJURIOUS INSECTS OF 1904. 33 



When the syringe is used with kerosene, the rose is un- 

 screwed and a small nozzle with one aperture, considerably 

 larger than the holes in the rose, put on in its place. This 

 is used when treating cracks in floors, etc. 



Before the work with carbon bisulphide or with kero- 

 sene is begun, elevator legs, spouts, purifiers and all in- 

 fested machinery must be thoroughly cleaned, in other 

 words freed from all matted flour. When the spouts are 

 lined with tin, affording a retreat for the worms beneath 

 the tin, the wooden sides must be removed to get at the 

 culprits. Swabs of cotton waste or pieces of old sacks 

 should be run through the elevators (stuffing these swabs 

 into cups), taking off caps of elevators and having men, 

 MV* stationed at the top, take out the ascending swabs when 

 C_D they reach them, and put in other swabs in the descending 

 P'§ '4- jgg. ^Yhe elevator brush', Fig. 13, might be well used in 

 this connection, or brushes made from the same material as the 

 belting, frayed on three sides and riveted to cups. All conveyors 

 should be taken out and thoroughly cleaned. Purifiers and reels 

 and insides of conveyor boxes, all machinery in fact, should be 

 thoroughly sprayed with carbon bisulphide after having been 

 cleaned. The cloth tubes on dust machines should be burned. In 

 treating elevator legs with carbon bisulphide, the same method can 

 be used as in cleaning, described above, saturating the swabs with 

 the liquid. A swab should take up about one pint of the liquid. 



All this means the expenditure of time, and money for material. 

 An ordinary sized mill may, in this process, use from 1,000 to 1,500 

 pounds of carbon bisulphide, or even more, to say nothing of the 

 large amount of kerosene employed. We are reliably informed 

 that bisulphide of carbon can be purchased for 6}^ cents per pound 

 of a dealer in New York City and St. Louis. This price does not 

 include container, credit for which is allowed upon its return. 



Caution: The gas generated by bisulphide of carbon is inflam- 

 mable. Therefore, while it is being used and until the mill has 

 been thoroughly aired after treatment, no light of any kind should 

 be allowed in the mill. A lighted cigar or pipe, lantern, or lighted 

 match, if brought into the mill when filled with gas, might cause 

 an explosion. 



