In pregnancy the female experiences signs and symptoms resulting from changes in the condition of her organs and functions. The suppression of the courses or menstrual discharges is considered in the popular mind an unerring proof of pregnancy, yet, as a matter of fact, this is far from the truth. I have known of two women who menstruated regularly during the entire period of their pregnancies, and there are a number of reliable cases recorded of women who menstruated during pregnancy and at no other time. It is a rule, that the menses cease during pregnancy, but it is equally certain that the menstrual function becomes suspended from other causes, and these are quite numerous, so that taken by itself, the sign is of little importance. Young married women not infrequently have a slight menstruation for two or three periods after their first conception, and on the other hand, newly married women will have their menses occasionally arrested, and this may continue for two or three months and indeed no pregnancy exist. Nausea and vomiting is also presumptive evidence of gestation. Some women are affected with sick stomach almost from the moment of conception, and from actual experience they are so certain of their condition, that they can calculate with certainty the day of their confinement from the time when they had their first feeling of nausea. Experience seems to teach that a certain amount of nausea, _the morning sickness_, and the vomiting which accompanies or follows it, is to be met in women who go through a natural or healthy pregnancy, so that many eminent authorities have looked upon this symptom as a physiological accompaniment, and one of the most constant and reliable symptoms. The vomiting and nausea of pregnancy is different from that which is an indication of general ill health; in pregnancy the vomiting is followed with a sense of relief, and the patient is for the time being quite easy. The length of time that women feel this gastric irritability varies in different individuals; ordinarily it will cease about the fourth month, sometimes sooner, and it may return again during the last two or three months of gestation. It is supposed to be due to a reflex action of the spinal cord from the uterus to the stomach. It must be remembered, however, that a disease of the uterus, a fibroid or ovarian tumor, and a suppression of the menses from other causes than pregnancy will occasion nausea and vomiting.