Contributions to the Research of the Active Constituents of Cape Aloes. By Hans Kiefer, Apothecary at Basel. One of the purposes the dissertation is the acquisition of the Doctor's degree. Thanks are extended to members of the faculty of Pharmacy‐Prof. Dr. H. Zornig and Dr. P. Casparis. Among the references cited is the foregoing dissertation, the method of C. H. Briggs for the estimation of aloin in aloes, p. 774 of September JOUR. PH. A., 1923, and reinvestigation of the proximate composition of Rhamnus frangula, John A. Gunton and Dr. George D. Beal, September JOUR. A. PH. A., 1923, pp. 669‐682