Nurses probably will never be called upon to use the _x_-ray, but this most wonderful manifestation of electro-force has recently taken a prominent position as a diagnostic and therapeutic agent. Parts of the human body heretofore only revealed by the use of the knife or post mortem are now plainly discernible during life through the use of this force. The field of its therapeutic application is a large one, and disorders which have been considered incurable or difficult of cure by other means now yield readily to the _x_-ray. FOOD CONSTITUENTS. =The Wise Combination of Food.=—In order that each meal may be planned to meet the needs of the body it is necessary that it contain protein, fat, carbohydrate, mineral matter, and water. Some flavor foods should enter into each meal. Flavor is important because it stimulates the appetite and because it stimulates the flow of digestive fluids and thus aids digestion. Such foods are only injurious when they are used to excess. In that case the nerves which control the flow of digestive fluids are overstimulated and at last become weakened. Avoid the use of too many flavors at one meal. SOURCE AND USE OF CHIEF FOOD CONSTITUENTS. Chief functions in the body. { Meats { { Fish { Build tissues. { Eggs { I. { Milk { Protein { Cheese { Repair daily waste { Peas { of tissue. { Beans { Give heat energy. { Gluten in flour { { Butter { { Cream { Give heat energy. { Fat of meats { II. { Cheese { Fats { Oil in nuts { { Olive oil { { Egg yolk { { Corn oil { Produce fat. { Seed oils {