Garbage.--As a medium for the development of flies, garbage may be considered next in importance to excreta. The eggs of the fly hatch in about twenty-four hours, and garbage which is retained in the kitchen for that length of time may contain flies in the grub stage. To prevent this development, all garbage should be covered and pails should be emptied as often as possible. In country districts garbage should be burned in the kitchen or buried in the garden at frequent intervals, twenty-four hours being the maximum time it should be retained. Vacant Lots.--Vacant lots frequently contain appreciable quantities of organic matter in a state of decomposition, affording favorable breeding places for flies. These vacant areas should be maintained in a state of scrupulous cleanliness. Foodstuffs.--In order to prevent contamination of foodstuffs, all foods that are eaten in the raw state and all foods that are exposed for sale after having been cooked should be carefully protected from contact with flies, by screens or covers. A point where rapid development of flies takes place is along the city's water front. This is due to the fact that many of the sewers do not discharge below the level of the water. All open drains should be eliminated, whether they be sewers, private house drains or drains from cess-pools. Precautions to be Observed.--Keep the house free from flies. Every fly should be considered a possible disease carrier and should be destroyed. Keep the windows of the house, especially the kitchen windows, carefully screened during the spring, summer and autumn. Protect children from exposure to flies, particularly children who are ill, and do not allow nursing bottles to be exposed to flies. Protect milk and other foodstuffs from contact with flies. Keep the garbage outside of the house, carefully covered. Abolish open drains near dwelling places. Stable manure should be frequently sprinkled with lime and kept covered. Earth closets and privy vaults should be treated with lime, crude creolin or crude carbolic acid at frequent intervals. Earth closets and privy vaults should be cleaned frequently in order to prevent excrement accumulating to an undue extent. To Kill Flies.--Dissolve one dram of bichromate of potash in two ounces of water, add a little sugar to this solution and put some of it in shallow dishes and place about the house. Sticky fly paper and fly traps may also be used. To clean the room where there are many flies, burn pyrethrum powder (Persian insect powder). This stupefies the flies and in this condition they may be swept up and burned.