Abstract
In correlating the rather wide variations observed in the whole blood specific gravity with either the serum specific gravity, cell count, hemoglobin per cent, cell volume or total blood volume, no absolutely quantitative relationship could be noted between the specific gravity and any of the other observations. The relationship obtained by plotting the whole blood specific gravity against the hemoglobin per cent is quite close with hemoglobin values between 82 and 94%, but on either side of this range, due to a change in the color index, the observed data deviate from the theoretical mean. When the whole blood specific gravity is plotted against the red cell count, tie travelling median thus obtained corresponds closely with the theoretical relationship which should exist between these observations although individual observations may vary normally within a range of [plus or minus]10 per cent.

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