Science: Dangerous Blood

The time may come when animals (including humans) will be able to poison the bugs that bite them. Last week the U.S. Department of Agriculture was hard at work on this project. Many modern insecticides have only a slight effect on warm-blooded creatures. An animal whose blood is spiced with some such deadly substance should make an unattractive meal for lice, ticks or mosquitoes.

The most successful experiments were with human body lice, which normally live on human blood. When work began at Agriculture's laboratory at Orlando, Fla., the lice were kept thriving on their favorite food. Hired human hosts lay face...

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