Patients sometimes wish to have their rooms darkened, because the light is painful to their weak and sensitive eyes. It is far better to shade the eyes and admit the sunlight into the room, since its rays cause chemical changes to take place, which favor the return of health. Many invalids can ascribe their recovery to the influence of a sun bath. There are, however, conditions in which the patients should be screened from the light. In such cases a little arrangement of the curtains or shutters will accomplish all that is to be desired. Patients convalescing from acute, or suffering from chronic diseases, should receive the influence of light in the open air, and be in it several hours every day. Light and pure air stimulate a healthful development, induce cheerfulness, hope, and recovery, while darkness begets gloom, sadness, despondency, disease, and ultimately death. WARMTH is essential to the well-being of the patient, and it is necessary that a proper temperature be maintained in the room. Except in very warm weather, a little fire should be kept in the room, and at the same time fresh air should be admitted from without, and a uniform temperature thus preserved. This arrangement is especially necessary in localities where great variations in temperature are experienced during the day and night. The normal temperature of the body ranges from 98° to 99° Fahr. The minimum occurs from 2 to 6 A.M.; the maximum, from 1 to 6 P.M. The deviation of a few degrees from this standard indicates disease, and the greater the deviation, the greater is its severity. During the early stages of acute diseases, the animal heat is generally increased, and should be allayed by bathing, and cooling or acidulated drinks. In the latter stages, the temperature becomes diminished and the condition of the system is favorable to congestions, which are most likely to occur between the hours of 2 and 6 A.M., when the vital powers are lowest. The patient then becomes feeble, his extremities grow cold, and he has what is termed a "sinking spell," and perhaps dies. It is during these hours that additional covering, the application of hot bricks to the feet, and bottles of hot water to the limbs and body, friction upon the surface, stimulating drinks, and increased vigilance on the part of the nurse will often save the patient's life. But, unfortunately, at these hours the nurse is apt to get sleepy and inattentive, the demands of the patient go unheeded, and a sacrifice of life is the result. Persons suffering from chronic diseases, or those in feeble health, should preserve their vital energies by dressing warmly, by wearing flannels next to the skin, and by carefully protecting the feet from cold and moisture.