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METHODS FOR THE STUDY OF FERMENTS
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![](http://upload.wikimedia.org/wikipedia/commons/thumb/3/31/Defensive_Ferments_of_the_Animal_Organism_-_p53.png/400px-Defensive_Ferments_of_the_Animal_Organism_-_p53.png)
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