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2. It is concluded that such a porphyrinuria does not derive from an abnormal breakdown ofthe prosthetic group ofhaemoglobin, but in some other way. Dietary deficiences are thought to be responsible for the failure to observe this phenomenon in the present experiments. 3. The increase in faecal excretion ofthe urobilins was not noticed in all the rats treated with the drug, but in most there was a marked increase in the ratio of mesobilene-b to tetrahydromesobilene-b. The latter phenomenon is probably due to the influence of the drug on the flora of the intestines.

Acid-soluble pigments of shells. 1. The distribution of porphyrin fluorescence in molluscan shells