Abstract
The curves for the total numbers of erythrocytes show waves of several days'' duration which are made up of smaller daily variations. The zone within which these fluctuations occur is relatively small. With the methods employed no correlation could be made between points in the curves for the numbers of erythrocytes and those of the cell volumes, Hb contents, corpuscular values and numbers of reticulocytes. Menstruation does not cause any change in the patterns of the curves. Increases and decreases at that time can only be interpreted as similar to those appearing in the intermenstrual periods.

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