CHAPTER IV

HOW INSECTS CAUSE OR CARRY DISEASE 40

Numbers, 40; importance, 41; losses caused by insects, 41; loss of life, 42; _The flies_, 43; horse-flies, 43; stable-flies, 44; surra, 45; nagana, 45; black-flies, 46; punkies, 46; screw-worm flies, 47; blow-flies, 48; flesh-flies, 48; fly larvæ in intestinal canal, 49; bot-flies, 50; _Fleas_, 52; jigger-flea, 53; _Bedbugs_, 54; _Lice_, 54; _How insects may carry disease_, 55; in a mechanical way, 55; as one of the necessary hosts of the parasite, 56.