At the other extreme the enervation of the poor whites, while mainly due to malaria and hookworm, had as a contributing cause the limitation upon their wage-earning opportunity which the slavery system imposed.

Studies of hookworm disease in Szechwan Province, West China.

Studies of hookworm disease in Szechwan Province, West China.

Fifty-two per cent of the total had hookworm.

"And while he's about it, have him send a hookworm to do you up the back.

"Hookworm," said the native.

" "But," said the stranger, "I was not aware that the hookworm is painful.