1902, Archibald Donald in The Journal of Obstetrics and Gynæcology of the British Empire, Baillière, Tindall & Cox; Volume I, page 363:In one case there had been a period of amenorrhœa of nearly two months, while in the other there had been no absence of the ordinary menstrual period. In one case hæmorrhage followed upon the period of amenorrhœa, while in the other the hæmorrhage had started at what was thought to be a normal menstrual period.
