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INSECTS AFFECTING HEALTH OF MAN OR ANIMALS. 7 
high and 18 inches in diameter. Inside of this and attached to the 
base is a cone 22 inches high with an opening at the apex of about an 
inch in diameter. Traps of this kind can be made from wooden 
barrel hoops, barrel heads, and lath as the framework for the necessary 
screening wire. 
The most effective baits for such traps are waste beer, a mixture of 
cheap molasses and water, or banana and milk, or a sirup made of 
brown sugar, 1 part, plus water, 4 parts. A mixture of equal parts of 
brown sugar, cheese, and water is also good bait if it has been stand- 
ing a few days. A large number of traps should be in operation at 
the same time, placed in all locations where flies are seen to con- 
gregate. The insects may be killed in the traps by applications of 
hot water or with sulphur fumes. It is necessary to empty them at 
frequent intervals and to keep the bait renewed. | 
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Fic. 5.—Imaginary cross section of an arrangement suggested for trapping maggots, for use where manure 
production is large: a, Pump; c, concrete floor and walls of cistern; 0, outlet pipes leading from floor of 
maggot trap tocistern; p, platform maggot trap; t, cistern forliquid manure; g, ground level. (Hutchison.) 
Poisoned baits—One of the simplest means of destroying adult flies 
is by use of poisoned baits. A solution of formalin (one-half teaspoon- 
ful) in sweetened water or milk (1 ounce) is an excellent poison. It 
should be placed in shallow dishes with a crust of bread, which 
affords increased surface for the poison and place for the flies to 
alight while feeding. Such dishes should be placed wherever flies 
collect. Another poisoned bait is made according to the following 
formula: Dissolve 1 pound sodium arsenite in boiling water; then add 
it to a solution of 10 per cent of brown sugar in 10 gallons of water. 
This may be exposed in dishes in the same way, or spread over the 
surface of manure piles and all places where flies are seen feeding. 
In the use of such baits great caré should be taken to avoid the acci- 
dental poisoning of men. 
COCKROACHES. 
Cockroaches are among the commonest insects found associated 
with food, especially where the food is being handled in large quanti- 
ties. One of the most effective means of ridding premises of roaches 
is dusting with commercial sodium fluorid, either pure or dilutect one- 
rer ne eee rere 
NSS aa 
