With regard to the protection against cold water, it is necessary that the external covering should be impervious to and not affected by water. India rubber stockings, waders, and boots have been used by men working in water, not only as a protection against wet, but also against cold. The best results have been obtained by the use of a waterproof covering that can be worn inside the boot, not because it is the only, or even the best possible method, but because it appears to be the simplest and most practical. A waterproof top boot, so devised as to leave a fairly wide air space between the boot and the greater part of the foot, ankle, and lower part of the leg, would be more efficient and probably more convenient, provided the material used was soft and light, and did not interfere with movements. To obtain this result a new type of boot would be required. The treatment of trench foot is similar to that of frost bite. +Motorman’s Foot.+ This is a condition caused by occupation, and the symptoms found are usually those of a flat foot combined with enlarged veins. The chief complaint is that of pain in the calf of the legs, which is increased upon standing for any length of time. The treatment is that for flat foot and enlarged veins. +Chauffeur’s Foot.+ This is a condition also caused by occupation. On account of the position assumed in driving an automobile, the tendons and muscles of the leg are usually affected and a tendosynovitis very frequently occurs. The symptoms and treatment have already been described. Rest is without doubt the best therapeutic measure. +Bicycle Foot+ is another occupational disease. The chief symptoms are those of cramps in the calves of the leg, and pains of a severe neuritic character. At times the onset is very sudden, and the cramps are so severe that it is impossible to extend the leg without causing great pain. Flat foot is usually associated with the above condition. The treatment is rest and the administration of the salicylates for the relief of pain. Bicycling is ordinarily a beneficial exercise for the foot muscles. When bicycle foot results from this exercise it is usually evidence that the bicyclist had an abnormal condition of his foot muscles and foot joints before he took up the exercise in question. CHAPTER XIV +VERRUCA (WART), CALLOSITY, HELOMA (CORN OR CLAVUS)+ +DISEASES OF THE NAILS—INGROWN NAIL+ +VERRUCA OR WART+ +Definition.+ A verruca is a circumscribed overgrowth of all the layers of the skin, varying in size from a pin’s head to a small nut. These growths may be single or multiple, and may come and go without any special reason. _Verruca plantaris_, or plantar wart, is observed on the sole of the foot; it may be single or multiple. It is very painful; it may be the size of a pea and is often mistaken for a callosity, from which it may be distinguished by the pain on pressure, and the tendency to bleed when the horny layer is removed.