OCCURRENCE OF THE FIRST MENSTRUATION AS INFLUENCED BY CLIMATIC TEMPERATURE

Abstract

The author suggests that the climatic temperature is the most important factor for the commencement of menses. He introduced the idea of accumulated temperature, i. e. average temperature of the district multiplied by the age in days. This quantity calculated for the commencement of menstruation proved to be almost 80, 000 degreedays. He also suggested an explanation why the first menstruation sets in as early as at 9 years of age in India.