6 INSECTS AFFECTING HEALTH OF MAN OR ANIMALS. 
economical. (See the Sanitation of the Second Division, United States 
Army, at Texas City and Galveston, Tex., March 1 to July 31, 1913, 
Military Surgeon, December, 1913.) 
Treatment of latrines —Latrines should be fitted with sanitary fly- 
tight covers, and may be treated in one of two ways. One method 
which has been used is to cover the pit with hay sprinkled with oil 
and burn out at frequent intervals. Another method which might 
be used would be to treat liberally with powdered borax or crude 
Fic. 4.—A maggot trap for house-fly control. View of the maggot trap,showing the concrete basin 
containing water and oil in which larve are drowned, and the wooden platform on which manure is 
heaped. (Hutchison.) 
earbolic acid every few days, finally filling the pit with earth and con- 
structing new ones as needed. 
In connection with the reduction of flies in camps, attention must 
be given to possible sources of flies in the surroundings of the camp. 
Some inspection should be made of all places within 1,500 yards of the 
camp, and sanitary measures instituted. Under some conditions the 
house fly travels distances greater than 1,500 yards, and if flies are 
still prevalent after the operation of the foregoing control measures it — 
would be well to make inspection still farther from the camp with the 
view to discovering and eliminating breeding places. 
Screening.—This is a valuable measure when screens are constructed — 
well and kept in good repair. It should be supplementary to attack 
against the breeding places. | 
Trapping.—One of the best fly traps is the conical hoop of the 
design shown in the illustrations (figs. 6, 7). It is a cylinder 24 inches 
