Calcium Movement in Excitable Cells, which is a second in a series, is a collection of articles taken from articles published in Progress in Biophysics and Molecular Biology, just like the first. The monograph is divided into two chapters. Chapter 1, Transport and Metabolism of Calcium Ions in Nerve, tackles the mechanisms responsible for maintaining the electrochemical gradient for calcium and effecting changes for the permeability of the cell membrane to calcium ions. Chapter 2, Divalent Cations as Charge Carriers in Excitable Membranes, tries to find out if divalent cations such as calcium, barium, and strontium can permeate excitable membranes. With two in-depth studies about movement of calcium as well as other cations and the factors behind it, the text is recommended to medical doctors, biologists, and biochemists who wish to learn more about this phenomenon.