West European journals directly, in some cases through December 1971. We very much regret that the extensive Russian and Japanese literature had to be followed through abstracts or translations. Many 1969 publications are included; we have coordinated them with our 1970 review to avoid duplication. We have not attempted to include every reference to ion exchange in chemical analysis, and have deliberately passed over many publications that seemed to add only minor details to well-known procedures. As before, we have included a number of references to the basic physical chemistry of ion exchange.A notable trend over the past two years has been an increase in applications to organic compounds and compounds of biochemical interest. Interactions with ion-exchanging materials that do not depend on electrostatic forces are being consciously exploited and better understood. Many of the chromatographic separations of organic compounds listed below are not, in the strict sense of the word, ion-exchange separations, though they use ion-exchanging polymers and inorganic mate-