Breathing, and Bronchia.--The _bronchia_ are the branching small tubes which lead from the windpipe to all parts of the lungs. Two different states of these often pass as bronchitis. In one of these the tubes are swelled, congested, and full of fiery heat. The whole body is also fevered, and breathing is difficult, with cough. This is true BRONCHITIS (_see_). But often, with difficult breathing and irritating cough, there is no heat and fever. In this case bronchitis treatment gives no relief. This is, indeed, only an irritated state of the lining of the tubes, and far from dangerous. A change of climate to a drier atmosphere will often entirely cure it. Often also a time spent in a room, where the air is kept dry but fresh, and at one steady temperature of about 60 deg., will cure. Our chief purpose in mentioning it, however, is that this comparatively slight trouble may not be mistaken for true bronchitis. [Illustration: The Lungs and other internal organs.] Breathing, Correct Method of.--The capacity of an ordinary pair of lungs is about 250 cubic inches. In ordinary breathing, however, we only take in from 20 to 30 cubic inches. Hence the necessity for practising correct deep breathing. Correct breathing requires cultivation and effort at first, afterwards it will become unconscious. The head should be thrown back, the shoulders squared, and a slow deep breath gradually inspired through the nose till the lungs are filled throughout with air. The expiration should be just as gradual with relaxation of every muscle. It is most important that the _lower_ part of the chest should first be filled by depressing the diaphragm (the muscular floor of the lungs). Some practise is needed before this habit is acquired, but it is well worth cultivating. Place the hands on the sides of the abdomen while inspiring, to feel that _this_ is expanding. Teachers of singing insist on diaphragmatic breathing, which is also of great benefit to the stomach, liver, and other organs. By the movement it gives to the intestines their action is also assisted, and constipation is prevented. This deep breathing may be practised several times each day (say ten breaths at a time) till the habit of correct breathing is acquired. It will be found to have a wonderfully soothing and calming effect (_see_ Worry). Such exercise should always be taken in the open-air, or in a room with a widely open window. A good plan is to take them in bed before rising, with little or no clothes on, while lying flat on the back. Paleness, langour, irritability, and general ill-health result from insufficient breathing. Furthermore, the system becomes unable to resist disease. We know no aid to beauty more effective than the practice of deep breathing. Breathing, in Going Uphill.--_See_ Breath, and Nerve.