The new technique will be used extensively in the development of alloys for nuclear reactors and gas turbines as well as for many other purposes. The program will be carried forward in cooperation with Battelle.

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The possibility of employing conductance measurements for determining the diffusion coefficients of electrolytes has obviously occurred to many physical chemists, but this method has never been carefully exploited nor extensively used. As early as 1892, Niemoller' measured the change in conductance through a capillary tube containing a solution of a diffusing electrolyte. HaskelP measured the conductance a t various heights of an electrolyte diffusing in a tube 50 cm. long and 5 cm. wide. More recently, Lamms has employed conductance to determine diffusion constants of electrolytes in dilute solutions by a method which differs somewhat in principle from the one which we shall describe. In our preference for utilizing measurements in the later stages of the diffusion process we agree with Lemonde4 whose procedure in other respects bears little resemblance to ours.The most important characteristic of thc method developed in this study consists in measuring vertical diffusion in a closed cell, hy means of conductance measurements, between pairs of electrodes a t suitable positions near the top and bottom of the cell. The idea of utilizing the difference of conductances between the bottom and the top of the cell was suggested by Professor Lars Onsagcr, sonic years ago, a t which tiine hc dewloped the theory of the method and computed the dimcnsions of a cell suitable for ineasurcinents in dilute solutions. A few preliminary cxpcriments werc made a t Yale by Drs. Gosta Akerlof and Oliver A. Short which indicated promise of success. But difficulties arose due to control of temperature and convection, and to cell construction, which, in large part, have been eliminated as a result of this study. THEORY OF CELL AND MEASUREMENTThe simplest form of cell for an electrolyte diffusing vertically upwards is a rectangular parallelopipcd of height, a, and with electrodes 1~iem611er, A. Ann. der Phys. und Chem. 47: 694. 1892. 'RsrkeU, a. Phys. Rev. 07: 145. 1908. * L a m , 0 . 4Lemondo, H. Ann. de physlque (11) 9: 539. 1938.

The discrepancy in the case of the nitroanilines is, however, larger than would be expected. Summary The solubilities in water of sixteen slightly soluble organic substances have been determined by means of an analytical method employing an interferometer.