1. The solubility of acetylacetone has been determined in an acetate buffer solution of ionic strength C.1 in relation to pH and temperature. 2. The distribution coefficients of acetylacetone have been determined between chloroform, carbon tetrachloride, benzene and an acetate buffer solution in relation to acetylacetone concentration and pH. 3. The relationship has been established between the rate at which indium acetylacetonate reaches partition equilibrium and the pH, initial acetylacetone concentration in the organic phase, and the different organic solvents. 4. The extent of the extraction of indiumacetylacetonate has been determined for three organic solvents at two acetylacetone concentrations in relation of pH. The independence of the degree of extraction from indium concentration was established in the region between 10(-4) to 10(-6) M. 5. 5. The indium acetylacetone compound was obtained by extraction from organic solvents. 6. The stability constants were calculated by two different methods for the uncharged complex and intermediate complexes; also the constants for the various steps of the dissociation of indiumacetylacetonate.

The use of transistors in counting-rate meters has so far been restricted mainly to portable health and survey type monitors. This report points out that transistors may be used successfully in rate-meters of high accuracy and gives examples of practical circuits which may be designed to attain accuracies and linearities of better than +- 1%.