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Oxygen was removed by a current of nitrogen, and a known weight of potassium iodide was added.The data for the cells made with these solutions are given in Table II. The reproducibility was better than for the first series; differences between duplicates were not larger than 0.09 mv., and the average was 0.03 mv.The quantity p in Table II is the ratio of the molality of un-ionized acetic acid to the molality of acetate ion. The values for Ejs were calculated by the equation4*1 K = Elf( y) = En + k log [KI] + k log p + k log XhOAo in which KHoac is the ionization constant of acetic acid for which the value 1.754 X 10-5 was used.6 The value of f(y) is small and should become zero when p = 0. The relation of E\[ to ionic strength is shown by Curve II of Fig. 2. Extrapolation to infinite dilution gives a value for £"5 in good agreement with the value from the first series of cells, and £25 = -0.0405 v. can be

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The work done in connection with this paper deals with the perchlorates of barium, strontium, calcium, magnesium, lithium, sodium, potassium, rubidium, cesium and ammonium. Solubilities of the anhydrous perchlorates at 25°were determined in water and in anhydrous methyl, ethyl, w-propyl, isoand n-butyl alcohols, ether, acetone and ethyl acetate. The solubility of lithium perchlorate trihydrate was also determined in the above solvents. In the study of these perchlorates a careful search was made for .new hydrates and into the conditions for their preparation. HistoricalOn account of lack of space, no description will be given of previous work on the perchlorates of these metals, but the references only will be listed as a footnote.2 Preparation of Materials Perchloric Acid.-This was prepared by the method of Willard3 and was twice distilled under a pressure of 5-15 mm. It contained 70-72.5% of perchloric acid and was free from non-volatile matter.1 From a thesis presented by G. Frederick Smith to the Graduate School of the University of Michigan in partial fulfilment of the requirements for the degree of Doctor of Philosophy.2 (a) Serrulas, Ann. chim. phys., [2] 46, 297 (1831

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