Page:Defensive Ferments of the Animal Organism (3rd edition).djvu/78

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METHODS FOR THE STUDY OF FERMENTS
53

Finally, we may, for the purpose of tracing peptolytic ferments in tissues, inject into the tissues peptones and polypeptides, which contain sparingly soluble amino-acids, and observe directly whether any amino-acids are set free.

In all these experiments the co-operation of micro-organisms was most carefully excluded, and there can be no doubt that these ferments belong to the tissues themselves. The same holds for ferments