There are many breathing exercises, but every intelligent being can make his own exercises, so I shall describe but one. Have the hands hanging at the sides, palms facing each other. Inhale slowly and at the same time bring the arms, which are to be held straight, forward and upward, or outward and upward, carrying them as far up and back over the head as possible. The arm motion is also to be slow. About the time the arms are in the last position a full inspiration has been taken. Hold the position of the arms and the breath a few seconds and then slowly exhale and slowly bring the arms back to the first position. Repeat ten or twelve times. If while one is inhaling and raising the arms, one also slowly rises on the toes and slowly resumes a natural foot position while exhaling, the exercise will be even better. Hollow-chested young people can attain a good lung capacity and good chest contour in a very reasonable time. Persistence in proper breathing and proper exercise will have remarkable results in even two or three months, and at the same time nature will be painting roses on pallid cheeks. It is easy to increase the chest expansion several inches. Those who expand less than three and one-half inches should not be satisfied until they have gone beyond this mark. Elderly people can also increase their chest expansion and breathing capacity, but it takes more time, for with the years the chest cartilages have a tendency to harden and even to ossify. The less breathing the sooner the ossification comes. Many people are afraid of night air, for which there is no reason. The absence of sunshine at night does no more harm than it does on cloudy days. During the night, of all times, fresh air is needed, for less is used, and what little is breathed should be of as good quality as circumstances permit. Open the windows wide enough to have the air constantly changing in the bedroom. During the winter it will be necessary to put additional clothes on the bed, for no one can obtain the best of slumbers while chilled. Some may find it a better plan to use artificial heat in the foot of the bed. At any rate, during cold weather better covering is required for the legs and for the feet than for any other part of the body. People with good resistance can sleep in a draught without the least harm, but ordinary people should not sleep in a draught. It is easy to use screens so that the wind does not blow upon the face. If the air is kept stirring in the chamber the sleeper gets enough without being in a current. Some are in the habit of closing their bedroom windows and doors at night and opening them for a thorough airing during the day. If the bedrooms must be closed, close them during the day and open them wide at night, for that is when the pure air is needed. It does not make much difference whether they are open or closed while being unoccupied. It is actually sickening to enter some bedrooms and be compelled to breathe the foul air.