Medicine: Fleas on a Leg

A droll doctor is Rollo Eugene Dyer, assistant director of the National Institute of Health. His favorite drollery last summer was to pull up his trouser leg and exhibit a small, fine-meshed cage strapped to his skin. Friends peeping into the cage beheld a herd of fleas contentedly nipping at the doctor's epidermis. Raillery was always in order. Dr. Dyer is a collector of stamps. Had he now become a flea collector? He is fond of dogs. Was he shielding his dogs from vermin? No, Dr. Dyer would chuckle, and his friends seldom realized...

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