The maternity nurse can scarcely be expected to specialize in nutrition or in psychiatry, but she may give to her patients the practical benefits of many valuable discoveries in these fields. She may not be able to remember, for example, all of the sources and purposes of lime in the diet, nor of each of the protective substances, often referred to as vitamines, but any nurse can remember and be guided by the fact that her patient will not be satisfactorily nourished either before or after the birth of the baby unless she has a varied diet containing milk, eggs, and green vegetables. She also can explain to her patients that faulty dietaries are responsible for the tradition that each child costs the mother a tooth, as well as the fact there may be undernourishment even among babies who are fed at the breast, if the mother’s diet is inadequate. And though the mass of nurses cannot be expected to grasp all of the intricacies of psychiatry, they may without exception apply one of its most important principles by adopting a warm and sympathetic attitude toward their patients and by this means win their trust and confidence. The restfulness of this; the relaxation and general state of mind that this will engender in a large proportion of patients will exert a definitely beneficial effect upon the physical well-being of the expectant mother, the woman in labor and the nursing mother. These simple applications of important scientific discoveries that relate to the everyday life of her patient—these are things for the maternity nurse to bear in mind. She is nursing a human being who is passing through crucial periods and anything that affects her as a human being affects her as a patient. Apparently, then, the work of the obstetrical nurse necessitates a training in general nursing and its various branches, in addition to obstetrics, for there seems to be no aspect of nursing which may not, under some condition, have its place in the care of the mother or her baby. All of this training, however, will prepare her for effective work only if she herself has a spirit of eagerness and enthusiasm. But if she has these and even a little training, she may do much. Accordingly, let the nurse who has been prepared by a general and special training, and who wants to be of the greatest possible service to the maternity patient start by appreciating a few general principles which will be absolutely indispensable to the success of her work. They may be expressed somewhat as follows: 1. _Cleanliness_—under all conditions, to protect both mother and baby from infection. 2. _Watchfulness_—for early symptoms of complications in either mother or baby. 3. _Adaptability_—to the patient, the doctor, and the surroundings. 4. _Sympathy_—for every mental and physical stress which the patient may suffer.