BIOELECTRIC POTENTIALS IN VALONIA : II. EFFECTS OF ARTIFICIAL SEA WATERS CONTAINING LiCl, CsCl, RbCl, OR NH₄Cl

In their influence on the P.D. across the protoplasm of Valonia macrophysa, Kütz., Li⁺ and Cs⁺ resemble Na⁺, while Rb⁺ and NH⁺₄ resemble K⁺. The apparent mobilities of the ions in the external surface layer of Valonia protoplasm increase in the order: Cs⁺, Na⁺, Li⁺ < Cl^- < Rb⁺ < K⁺ < NH⁺₄.