I. Nature of Urobilin Obtained after Amalgam Reduction of Human Fistula Bile. ∗

Summary and Conclusions

The amalgam reduction of the native bilirubin in 7 samples of human fistula bile led only to mesobilirubinogen which in turn yielded urobilin IX, a, on suitable oxidation. No evidence of stercobilin formation was obtained. The formation of stercobilin is thus shown to depend upon a further chemical activity which is peculiar to the intestinal tract.