In 1928, Emmet Kennard Knott, a Seattle physicist and X-ray dealer, began to experiment with the effect of ultraviolet rays on the blood of dogs. In a local veterinary hospital he infected dogs with streptococci and staphylococci, withdrew a large amount of blood from their veins, irradiated it under an ultraviolet lamp, and put it back in circulation. Theoretically, the rays should have killed the germs. Instead, they killed the dogs.
One winter night, after several months of this kind of thing, stubborn Mr. Knott went down to the dog hospital with a doctor...
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