IN May of last year1 we announced that we had been able to purify and crystallize the chief toxie principle of rattlesnake venom, which we called crotoxin. Crotoxin contains the whole neurotoxic and hæmolytic activity of the crude venom; but both have a 25 per cent greater activity than the crude.

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SLOTTA, K., FRAENKEL-CONRAT, H. Crotoxin. Nature 144, 290–291 (1939).

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