Abstract
The writers report experiments performed with filtrates of old cultures od colon bacilli upon the isolated and perfused rabbit gut. According to the experiments the writers suppose to exist one or more substances in the filtrates of old cultures of colon bacilli with physiological activity upon the isolated and perfused rabbit gut. Such activity is essentially characterised by a rapid increase of the intestine tonus. When the Ringer-Tyrode solution containing the filtrate is removed and replaced by a fresh one, the increase of the tonus disappears. Liver-broth medium causes a somewhat increase of the tonus of the gut but much less in intensity.
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