The pupil who possesses these bells will find that instead of having to be continually buying heavier dumb-bells, one pair will suffice him for all time. All that it will be necessary for him to do will be to purchase, at a small expense, new springs from time to time. All pupils are advised to use the dumb-bell, upon the merits of which I need not further enlarge. As will have been seen, this is not a mechanical device which will render unnecessary the employment of will-power; that would be opposed to all my theories and teaching. On the contrary it will aid in developing will-power, as it will stimulate the pupil to put it forth, and guide him how to use it in the proper direction. CHAPTER VI. THE MAGIC COLD BATH. I am sometimes accused of being a bit of a faddist about the use of the cold bath, and possibly the heading of this chapter may give strength to that opinion. But its exhilarating and health-giving effects really justify the use of the adjective. The longer I live, and the greater my experience, the more am I convinced of its virtues. Let me advise every pupil after exercising, while the body is still hot, to take a cold bath. It does not matter how much he may be perspiring; the cold bath will prove exceedingly beneficial. He must be careful, however, not to take his bath if he is out of breath. The exercises will, no doubt, quicken the heart’s action; but in from three to five minutes after the series is completed, the heart should be beating normally again. For persons who suffer from weak heart I should not advise a cold bath. As a general rule there is no need to ask the question, “Is my heart weak?” For if it is weak you should know it beyond a doubt. After every little exertion, though the assertion may appear paradoxical, you will feel it beating in your head. In advising cold baths, I speak, of course, for persons in the enjoyment of ordinary health. The bath should be begun in the summer and continued every morning throughout the year. In the winter, if the room is cold, light the gas and close the window. If your hair is not injuriously affected by cold water--and in many cases, I believe, cold water will be found to strengthen it--begin, as you stand over the bath, by splashing the water five and twenty times over your head. In any case, if you are averse to wetting the hair, be careful to begin by sponging the temples and nape of the neck. Next, whilst still standing over the bath, splash the water fifteen times against the chest and ten times against the heart. Then jump into the bath, going right down under the water. In the summer you may remain in the water from ten to fifteen seconds, but in the winter let it be just a jump in and out again.