Thus Dr.Helen P.Kennedy obtained elaborate data concerning the menstrual life of one hundred and twenty-five high school girls of the average age of eighteen ("Effect of High School Work upon Girls During Adolescence," _Pedagogical Seminary_, June, 1896).

Only twenty-eight felt no pain during the period; half the total number experienced disagreeable symptoms before the period (such as headache, malaise, irritability of temper), while forty-four complained of other symptoms besides pain during the period (especially headache and great weakness).

Jane Kelley Sabine (quoted in _Boston Medical and Surgical Journal_, Sept.

15, 1904) found in New England schools among two thousand girls that 75 per cent.
had menstrual troubles, 90 per cent.

had leucorrhoea and ovarian neuralgia, and 60 per cent.