The average Londoner finds so very few methods of exercise open to him that he is forced as a rule to make walking serve for all, and he is in the habit of boasting that no other exercise brings into play so many muscles. From a letter in a daily paper, written apparently by one who knows, this is exaggeration. Walking does not exercise every muscle of the body, nor is it the best exercise for the muscles. But, adds the writer consolingly, it has no equal in training the system generally. And this ought to be praise enough for the most ardent devotee of the pastime. But a great deal depends on how we walk. Mr. C. B. Fry urges his readers to walk “as if they were someone,” that they should walk “exactly at the rate at which the heart beats, once to each step,” as steady, rhythmic motion, long continued, is the most health-giving thing possible. More important still, he adds, is the deep breathing of fresh air. London air is not always fresh, but we imagine that a deep draught of even a moderate brand of air has its merits, and should not be rejected simply because one chances to swallow a few particles of soot while taking it in. Let us then avoid cabs and other Sybaritic aids to movement, and pace rhythmically to our duties in the morning, with mouths open to their widest stretch. Thus shall we acquire health, and live to a green old age.