ENTOMOLOGY

170 SANITARY ENTOMOLOGYThe use of larvicides and other chemical compounds in barn yards isusually inadvisable. Thorough cleaning ordinarily will ha,ndle the situation.Crudc oil has been used in yards where considerable numbers ofhorses are kept to pElrmit firm pa,cking of the ground and keep downdust in dry weather. Borax, either dry or in solution, may be used inbreeding places which can not be cleaned thoroughly. Poultry and hogsconsume large numbers of larvre and pupre and scatter the manure so itwill dry out rapidly. These agencies should not be depended upon, however,to effect control.The employment of conical fly traps about st,ables and dairy barns,if they are kept properly baited, will aid in reducing the number of houseflies. Cheap molasses and water (1 to 3), or milk curd, brown sugar andwater in equal parts form good baits. The latter, if kept moist, willremain attractive for two or three weeks. It is comparatively unattractivefor the first few days. Hodge type window traps aid in reducing thehouse fly and stable fly troubles within barns if the barns are closelybuilt and the other windows ,darkeIJed or screened.FLY CONTROL IN PIG LOTS AND PENSThe hog has been looked upon from time immemorial as a filthy animaland he is usually compelled to live in surroundings which would neverbe tolerated for any other beast. .One of the special problems which confronts the municipal and thearmy sanitarian is the utilization on a large scale of .city and campgarbage by hog feeders. There appears to be no more economical way'of disposing of garbage than by this method, but the conditions underwhich the feeding is to be done must be given strict attention by sanitarians.In the vicinity of nearly every city and large army camp islocated one or more of these garbage feeding plants, the number of hogsranging from a few hundred to several thousand. For the most part thegarbage is sold to feeders under annual contract. Army garbage atleast is supposed to be free from glass, cans, coffee grounds, and liquids.The contractors furnish the garbage cans, remove the garbage daily andreturn empty cans which are supposed to be thoroughly cleaned. If theorange, grapefruit, and lemon peels could be eliminated from the garbage,the mass of material not eaten by the hogs would be materially reduced.Garbage feeding plants should be operated under approximately thefollowing set of rules:1. Location of Feeding Stations.-Station should be located as farfrom habitations as possible and also well 'removed, two miles or more, fromthe city limits or the precincts of an army camp. Our recent experimentsshow that flies of various species, including the house fly, travel thirteen