1. The intravenous injection of killed organisms is followed by the mobilization of a non-specific protease and lipase; the rapidity and extent of this reaction depend upon the toxicity of the organism and on the resistance of the organism to proteolysis.

2. The temperature and leucocytic curve bear no relation to the ferment changes.

3. The serum antiferment is usually increased after the injection.

4. Of the organisms studied, the typhoid bacilli produced the most marked ferment changes, and the tubercle bacilli the least.

5. The toxicity of the dried organisms cannot depend wholly upon proteolysis in vivo, but must depend in part on the preformed toxic substances liberated on lysis.

6. Serum protease should not be considered as the sole exciter of intoxication through the production of protein split products; it seems possible that its function may in part be one of detoxication.

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