My lady goes to the doctor for her headaches and _crises de nerfs_. "Dyspepsia and autotoxaemia," says the doctor. "Try such-and-such a diet for a month, then go to Aix-les-Bains." But how would my lady be ashamed did he tell her plainly: "Madam, though I observe that you bathe frequently, your cleanliness, like your beauty, is only skin-deep. You are fair without and foul within. Your alimentary canal is overloaded and your blood is so unclean that it has poisoned your nervous system. Eat less, take more exercise and drink plenty--of water. Try to be as clean as your gardener." It has been remarked that the labourer who sweats at his work is, in reality, far cleaner than the bathing sedentary man, for the labourer has a daily sweat-bath, whereas the other only washes the outside of him: the cleanliness of the latter is skin-deep, and of the former blood-deep. Once stated, the fact is obvious. Moreover, the labourer has the additional advantage of being self-cleansing, whereas the sedentary man, for his inferior kind of cleanliness, requires a bath and all sorts of apparatus. No doubt, in time we shall learn to value both kinds of cleanliness, each at its worth. The Martians of fiction, when in a fair way to conquer the earth, succumbed before earthly microbes to which they were unaccustomed, against which they had not acquired immunity. If by antiseptics they could have kept these microbes at bay, they would have done well, but if, like mankind, they had possessed self-resistance against them (that is, if they had been self-cleansing) it would have been still better. There is no paradox in saying that, practically, it is very difficult for a healthy person to be genuinely unclean; and that ideally, in the surgeon's eyes, we are, all, rich man and tramp, so unclean that there is little to choose between us, and every one of us requires a comprehensive scrubbing in an antiseptic tub. [Sidenote: _DISADVANTAGES_] But just as the habit of aiding nature by eating predigested food is bad, so too rigid a habit, too great a need of cleanliness is a positive disadvantage in the struggle for existence. Harry Stidston says fleas are loveable little creatures. I have had to learn to put up with one or two sometimes. Tommy makes his mother undress him in the middle of dinner to find one. In other words, Harry Stidston can do his work and live under conditions which would put me to flight, and I have a like advantage over Tommy. Again, Tony can do with an occasional bath and can eat his food with fishy hands, while I am a worm and no man without my daily bath, or at least a wash-over, and, except at sea, turn against the best of food if I can smell fish on my fingers. The advantage is Tony's. It is good to be clean, but it is better to be able to be dirty.