A survey was made by means of questionnaire papers on items: age at the initiation of menstruation, age at which the menstruation become regular, states before as well as after the employment as to regularity, duration of bleeding in days, amount of the blood during one period, and subjective symptoms. Comparing the state the employment with that before it and comparing nitroglycol workers with the control, no evidence was detected that menstrual disorders were involved as a result of exposure to nitroglycol.