A Ind. New Method of Colorimetry. PAUL DOSNE (Bull. Xoc. Mulhouse, 1922, 88, 73--77).-A beam of light (from a Nernst lamp or other suitable source) is directed upwards through a column of a solution of known strength of the coloured substance under investigation and the height of the column necessary for the complete absorption of the transmitted light, as observed through a spectroscope, is determined. Since under these conditions the colouring power of a substance is directly proportional to

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... he height of the column and to the strength of the solution, the method allows various colouring matters to be compared when dissolved in water, alcohol, or other suitable solvents. A. J. H. Colorimetry. PAUL FLEURY (Bull. Xoc. Chim. Biol., 1922, 4, 223--232).-A discussion of the conditions under which colorimetric methods yield the most accurate results. E. S. Colorimetry. (MLLE) Y. GARREAU (BUZZ. Xoc. Chim. BioZ., 1922, 4, 233-234) .--The accuracy of the colorimetric method is indicated by the concordant results obtained during a large number of estimations of sugar by the picric acid method.