But, leaving, these references to the many associations attached to the number five, it must not be supposed that my desire is to make people unnecessarily timorous about themselves on the score of health. This is certainly not my intention, for such a frame of mind would defeat the very object I have in view. Yet there still remains the fact that a little rational attention is indispensable if the vigour of the body is to be maintained at its best. There is a very great difference between carefulness carried to extremes in this respect, on the one head, and a heedlessness and total disregard of personal health, on the other. The golden mean between these two is the proper knowledge of what is required for the preservation of health, and so much conformity thereto as will give the best results. And yet it must be remembered that no cast-iron code can be laid down which would be applicable to one and all. No; idiosyncrasy, that personal peculiarity which makes each individual different from every one else, is too potent a factor to be ignored. In matters of this kind, each one, to a certain extent, is a law unto himself, and, consequently, what agrees and what disagrees is only discoverable by the individual concerned. In what follows, therefore, I have endeavoured to lay down rules for guidance which will be beneficial to by far the greatest number; although this element of the EGO must never be forgotten. CHAPTER III. ABLUTION--THE SKIN AND THE BATH. It has been estimated that the external skin of an ordinary adult is equal to an area of about twelve square feet, and that in a tall man it may be as much as eighteen square feet. There is a considerable difference between twelve square feet and twelve feet square, and it is well to mention the fact in order that there may be no confusion. From this large surface alone, therefore, it is quite easy to see that the skin requires to have some attention paid to it. But it is really far more important than even its extensive surface would be likely to indicate, for it fulfils no less than seven different duties. In the first place it serves as an external covering to the body, and, as we shall see also, the internal skin acts as a support to the internal organs. Secondly, it is endowed with an extensive system of nerves, which give rise to the sensations of touch, of temperature, of pressure, and of pain. In this way we can tell whether a substance is rough or smooth, and whether it is hot or cold; we recognise, moreover, the difference between a gentle pressure of the hand and one so forcible as to cause pain. Thirdly, the skin, as we shall find farther on, contains thousands of small tubes for the purposes of perspiration, and besides this, there are other tubes secreting, an oily substance. Fourthly, the skin plays an important part in regulating the temperature of the body. Thus in a warm atmosphere the skin becomes reddened and moist, and much heat is lost; on the other hand, when the