To be on the safe side a prospective mother who has previously had a miscarriage should not travel at any time during pregnancy; others are not obliged to follow this stringent rule except during the first sixteen and the last four weeks of pregnancy. In the former period there is some danger of miscarriage because traveling may cause separation of the relatively loose attachment of the ovum. In the latter period the muscle-fibers of the womb are usually irritable and therefore the rolling of a ship or the jolting of a car may set up painful contractions which in some instances expel the fetus. Generally there is the least risk of accident between the eighteenth and the thirty-second weeks, though patients should be careful even during this interval not to travel at the time when a menstrual period would ordinarily be expected. The length of the journey and the ease with which it can be made are also important features to be considered. Obviously there will be less danger of mishap from a short trip than from a long one; if possible, therefore, long journeys by rail should be broken so as to afford opportunity for rest. Railroad trips which do not exceed two or three hours are generally not so fatiguing that they must be prohibited, provided the individual is perfectly well. Traveling by boat is less tiresome than traveling by rail and, if equally convenient, the boat should be given the preference. Long automobile tours are attended with considerable risk of miscarriage and, therefore, are forbidden. MENTAL DIVERSION.--As a rule good health prevails throughout pregnancy; it would be enjoyed even more frequently if many prospective mothers did not think so much about the fact that they are pregnant. For this deplorable self-consciousness the spirit of the age is in part to blame; there never was a time, in all probability, when people took such a keen interest in all matters pertaining to health. It is also true, however, that fuller instruction is needed now because the temptations to depart from a regular, temperate way of living have notably increased. At all events the point has now been reached where the average man or woman knows something of anatomy, physiology, and the laws of hygiene. Such knowledge should be helpful, and generally is, but if it causes anyone to think incessantly about the workings of the body, to that person it is detrimental. We all know such individuals. They are made miserable because they scrutinize functions, like the beating of the heart, that go on automatically and should be left unobserved, or they minutely analyze their feelings and misinterpret normal sensations as the evidence of disease.