title: THE PENETRATION OF CATIONS INTO LIVING CELLS.
abstract: Direct tests of the cell sap of Nitella show that the protoplasm is normally permeable to Li, Cs, and Sr, and that penetration is more rapid in an unbalanced than in a balanced solution.
authors.affiliation: Division of Pharmacology, Hygienic Laboratory, Washington, D. C.
authors.forename: M M
authors.initials: MM
authors.lastname: Brooks