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On page 735, Vol. xxxv, No. 5, Figs. 1, 2, 3, and 4, for NaCl solution at 9 per cent read NaCl solution at 0.9 per cent. On Plate 58 of the same article, at the lower left hand corner, for NaCl 9 per cent read NaCl 0.9 per cent.
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