1. A phyto-pharmacological study of blood specimens from pernicious anemia revealed that the serum in all such cases is very much more toxic than normal human blood serum.
2. Such a toxicity is not shown by blood specimens examined from all other kinds of anemias or diseases of the blood.
3. These observations speak in favor of a toxic etiology for pernicious anemia.
4. The phyto-pharmacological test has been found useful in the differential diagnosis of pernicious anemia.