There must be an air space between the top of the hat and the man’s head. The hat must be ventilated and in very hot weather a wet sponge or cloth or green leaves should be carried in the hat. The shirt collar, if not very loose, should be unbuttoned. [Sidenote: Bathing] Besides bathing the feet the men should bathe their whole bodies frequently. Anyone familiar with our “regulars” on the march and who has seen them break for the water to bathe as soon as possible after a day’s march knows that it requires no order to get this done. But sometimes we must camp where there is no water available for bathing. Men should at least wash the crotch with a wet towel, especially if there is a tendency to chafe. Talcum powder should be used in such cases. [Sidenote: Drinking] Men should be carefully taught the disabling effects of alcohol if drunk the night before or during a hard march, especially if the march be made in hot weather. The men must also be instructed to care wisely for their diet and to avoid the excessive drinking of water on the march. Too little water is as bad. [Sidenote: Personal hygiene] All this instruction should be carefully given the men by their company officers under the general supervision of the regimental surgeon. The surgeon, with the approval of the colonel, should prepare an outlined scheme for instruction in first aid and in personal hygiene, having special reference to the soldier’s care of himself in the field. The surgeon should then instruct such company officers as have need of the instruction; the company officers then instruct the men. A part of the examination of the company at the end of its indoor period should be on these subjects. [Sidenote: Muscle development] The muscles must be _properly_ developed. It is not the strongest man who can best stand the march; it does not require great physical strength. The man’s muscles must be flexible, he must be trained to use them and be able to use them without causing physical pain. Marching as fully equipped infantry in the ranks is a very different proposition from walking along the road independently, and for the private in ranks with his load it is different from what it is for the officer with his. Many men of great strength are often what is called “muscle bound.” Others have certain muscles overdeveloped others underdeveloped. When muscles usually unused are brought into play, or when a man is forced into a constrained position, if it be kept up continuously for some time, serious pain and discomfort results and often ends in a physical break down. A good course in callisthenics or in gymnasium training is the best thing for the new man. It loosens him up, brings into play the different muscles, renders them flexible and gives the man control of himself. Then practice in marching, carrying his equipment, strengthens the necessary muscles and accustoms the man to the necessary constraint. [Sidenote: March training]