A. G. LOWNDES has described* not only the method indicated by the title of his paper but also methods for determining the water content of living (especially aquatic) organisms and in some cases the density of their protoplasm. The accurate determination of the weight is (with marine animals) achieved by weighing a density bottle full of sea water and estimating the halide in the contents of the bottle gravimetrically, followed by a weighing of the bottle containing sea water and a living marine organism and an estimation of the halide content of the water in the bottle. All these data may be obtained with great accuracy and from them the author calculates the weight, volume and density of the organism.
J. Marine Biol. Soc., 25 (1942).
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