Rhythmic Banding in Protoplasm

Abstract

1. The bathing of the protoplasm of slime molds in various salts and acids, or the injection of these into protoplasm, brings about the formation of rhythmic bands through the precipitation of protoplasmic proteins.2. Both the hydrogen ion and the ions of heavy metals produce banded precipitates in protoplasm. 3. The periodic precipitation of concentric rings in protoplasm bears a striking resemblance to the Liesegang phenomenon.4. The more rapid entrance of solutes at certain restricted and isolated points of the plasmodium indicates pronounced differentiation in the permeability of the surface.