Abstract
Opinions differ among investigators as to whether or not, the erythrocyte-diameter, is equal between sexes As the subject can't be properly discussed unless it is clarified by women's menstruation, I studied the erythrocyte-diameter of women before, during and after menstruation.
The result is as follows:
i) The erythrocytes-count and hemoglobin-Content have a tendency of diminution during meustrution.
ii) The erythrocyte-diameter is different by menstruation, but the difference is not so much manifest.
