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A reexamination of previous data has shown that the correction factor for absorption, in Sauer's formula for the calculation of absolute turbidity, must be based on the concentration of coloring matter alone, and not on the total lightabsorbing material including the turbidity. In all other respects Sauer's formula is of the same form as that developed by the writers, and if the correction factor, derived from theory, is based on the coloring matter only, its numerical value checks that of the term kc in the original formula of the writers, which was based on purely experimental evidence. Sauer's principle has therefore been accepted as a basis for calculating the correction factor from only the concentration of the coloring matter, and the writer's formula has been modified by substituting the new correction factor for their k°t erm. It is thus possible to use the same correction factor for calculating either the absolute turbidity according to the modified Sauer formula, or the coloring matter and turbidity, expressed as -log T, by the revised formula of the writers.The new formulas have been checked against the experimental data, and satisfactory agreement has been found.

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