All violent exercises and sports are of course to be avoided, particularly swimming, horseback riding, and tennis. While motoring and carriage riding are pleasant diversions, they cannot be classed as exercise. They should be taken only in comfortable vehicles and over smooth roads, so that there will be no jarring nor jolting, and the patient should not do the driving herself. A certain amount of exercise, in the shape of light housework, may be taken indoors. It is distinctly beneficial, if not continued to the point of fatigue, both because of the exercise which it provides, and also the diversion and interest, for these promote mental and physical health. But this indoor exercise must not interfere with, nor to any degree replace, the daily exercise out of doors; nor must it include heavy work, such as washing, sweeping, heavy lifting, running a sewing machine by foot nor much running up and down stairs. However, the amount and kind of work which a woman may comfortably and safely do are so related to what she has been accustomed to, that it is not possible to offer more than general suggestions, which will help in the planning for each individual. All patients will do well to moderate their activities at the time when they would ordinarily menstruate. There are patients to whom massage and gymnastics are beneficial during pregnancy, when for some reason the out-of-door activities are contra-indicated. This might be true of a patient with heart trouble, for example, or one who is being kept in bed to avert an abortion, and accordingly is a matter which must be entirely in the doctor’s hands. REST AND SLEEP. When we studied the bony structures of the female body, we found that as the abdominal tumor of pregnancy increased in size and weight, the body’s centre of gravity changed and the pregnant woman was required to make a constant, though unconscious effort to stand upright. This is probably one reason for the fatigue which expectant mothers so often feel without apparent cause, and for the fact that they are likely to tire rather more easily than usual. Accordingly, the patient may have to rest frequently during the day, in order to avoid the ill effects of fatigue. She should work and exercise in short periods rather than long, always lying down when tired, and for an hour or two after the noon meal. She must be particularly careful not to be over-active, nor to overexert herself at the time when menstruation would occur were she not pregnant, for fear of bringing on an abortion. This precaution is particularly important during the first four months, the period when abortions occur most frequently. Since eight hours’ sleep is usually considered necessary to keep the average person in good condition, the pregnant woman cannot expect to progress satisfactorily with less. In fact, it is so important to her general well-being that she should be taught and persuaded to do everything in her power to secure it.