ENTOMOLOGY

l7~ SANITARY ENTOMOLOGYreceive all drip. The lower side should be provided with a concrete ridgeprojecting about five inches. This edge along the back will hold mostof the unconsumed garbage, bones, e~c., as they are worked backward, andfacilitates thorough cleaning which should be done at not to exceed threedayintervals.5. Shade.-If location with plenty of trees can be chosen, this ispreferable to sheds for protection from the sun. Where sheds are neededfor protection either from sun or rain, they sh,ould be built on well drainedland and never placed over the feeding troughs. They should be sevenfeet above the ground so as to permit of easy cleaning. Temporary~shade can be constructed extending a few feet over the trougha if desired.6. Contracts.-Annual or longer contracts with thE!' Army or with-eml1icipalities are far more desirable than monthly contracts as they enablethe contractor to put up proper feeding facilities which he would notdo under short contracts. Contract!! should specify the character of feedingarrangements and penalize failure to keep the premises in satisfactorysan~tary co~~ition. The pens should be given frequent inspection bysamtary .officers.7. CleOlTliJn{J of Yards.-In addition to the cleaning of the ~:tteOnsumedgarbage from feeding platform the manure should be scraped upand disposed of, especially during rainy weather. During h9t dr~weather where ample pasturage is used manure is the source of verylittle fly trouble.8. Disposal of Bones.-Bones which are not retained on the feedingplatform and thos'e which are mixed with uneaten garbage pT')uld becollected at four-day ·intervals and placed in fly-proof bone rac~'. .Thesecan be built of lumber and screened on the outside and proyided withny-proof cover. It is desirable that the bones be removed entirely fromthe premises at frequent inte_-vals.9. Avoidance of Transporting Flies on Vehicles.-If garbage cansare properly cleaned there is less tendency for,flies"to follow them than ifleft dirty. Washing in a modera.tely weak solution of cresol tends torepel flies from them. The trucks should ~ washed off' occasionally.There is less danger of flies .following trucks back to camps when they areprovided with covers.,10. Q'lbOITbtity Fed.-Feeding so much ga;:.bage to hogs that it willnot be cleaned up should be discouraged.11. Final Disposal of Hog Manure and Unconsumed Garbage.-Thismaterial may be scattered thinly over cultivated ground and exposedto the sun or promptly plowed under. Where material is found to beheavily infested with maggots, it is advisable to dump it in piles some distancefrom the feeding plant and treat it with borax solution. About onepound of borax should be used to each 8 bushels. If the mass is very wet