1. Indol is more hemolytic in the presence of a deficiency complex than when a normal diet is fed.
2. The hemolytic effect can be abolished by supplementing the deficient diet with liver extract curative of pernicious anemia in man.
3. The hemolysis affects all hemoglobin-containing cells, including reticulocytes.
4. The repair of the anemia resulting from the administration of indol in the presence of a deficiency represents the cessation of a hemolytic process.
5. An abnormally low rate of production of erythrocytes may well be a factor in the production of the anemia.