SUMMARY
During the intracellular digestion process of Escherichia coli by Physarum flavicomum, acid phosphatase activity can be localilized in food vacuoles, in dictyosomes, in membrane-bound vesicles, and, tentatively, in smooth endoplasmic reticulum. Digestive events similar to that postulated to occur in various protozoans appear to be operative in P. flavicomum.