. Dr. Evans' How to keep well; . drop of 56 per cent in the typhoid rate, the drop being especially marked amongst the people who used dry closets. Terry also investigated the possibility of keeping down the flies on a garbage dump by covering the waste with eightinches of sand. He inoculated bread with germs, allowed flies to blow it,and then buried it in the ground. The flies were crawling out of the groundin a week. Along in November, when the ground in Florida was gettingcold, it took sixteen days for the eggs to hatch and the flies to get to thetop. Four feet of ground was not enough to s
. Dr. Evans' How to keep well; . drop of 56 per cent in the typhoid rate, the drop being especially marked amongst the people who used dry closets. Terry also investigated the possibility of keeping down the flies on a garbage dump by covering the waste with eightinches of sand. He inoculated bread with germs, allowed flies to blow it,and then buried it in the ground. The flies were crawling out of the groundin a week. Along in November, when the ground in Florida was gettingcold, it took sixteen days for the eggs to hatch and the flies to get to thetop. Four feet of ground was not enough to stop them. Stiles had pre-viously found that six feet would not suffice. When the eggs hatched theyoung ate the germs on the bread. Bacteria were grown from the fly German who tried inoculating bread with typhoid bacilli found them inthe fly specks after the flies had been out of the ground twenty-three conclusion was that dumps would breed flies however much dirt Fig. 386.—Larva ofthe Black Car-pet Fig. 387.—Fish Moth (en-larged). (Herrick SanitaryScience Series No. 3, CornellReading Course, Oct. 1,1913.) Wire DO TO Where you <2atoffen determines whar you eat
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