This review is a continuation of the preceding one, 1 without any duplication of references. It is based entirely on the examination of reprints received from the individual authors during the year. Therefore a great number of papers published in 1959, in addition to those covering 1960, have been included. As before, microscale determinations dealing with approximately 0.1 meq. sample are covered thoroughly in the text. Macro scale (> 1 meq.) and ultra micro scale (approx. 1 μeq.) determinations of interest are mentioned.