The membrane called the Hymen (or commonly, maidenhead), situated at the entrance of the vagina (the passage to the womb) sometimes completely obstructs the passage, so that the menstrual fluid cannot pass, and in consequence accumulates and distends the womb; and also presents an effectual obstacle to the accomplishment of matrimony. It is necessary in these cases that an opening should be made with a lancet or a trocar. Then, all the black, treacly-looking fluid that has accumulated should be syringed out with warm water, otherwise it might putrefy, and cause Typhoid Fever, and death.