‘The children walk every day; they are never out less than an hour when the weather is suitable.’ That is better than nothing; so is this: — an East London schoolmistress notices the pale looks of one of her best girls. “Have you had any dinner, Nellie?” “Ye-es” (with hesitation). “What have you had?” “Mother gave Jesse and me halfpenny to buy our dinners, and we bought a haporth of aniseed drops — they go further than bread” — with an appeal in her eyes against possible censure for extravagance. Children do not develop at their best upon aniseed drops for dinner, nor upon an hour’s ‘constitutional’ daily. Possibly science will bring home to us more and more the fact that animal life, pent under cover, is supported under artificial conditions, just as is plant life in a glass house. Here is where most Continental nations have the advantage over us; they keep up the habit of out-of-door life; and as a consequence, the average Frenchman, German, Italian, Bulgarian, is more joyous, more simple, and more hardy than the average Englishman. Climate? Did not Charles II. — and he knew — declare for the climate of England because you could go abroad “more hours in the day and more days in the year in England than in any country”? We lose sight of the fact that we are like that historical personage who “lived upon nothing but victuals and drink.” “You can’t live upon air!” we say to the invalid who can’t eat. No; we cannot live upon air; but, if we must choose among the three sustainers of life, air will support us the longest. We know all about it; we are deadly weary of the subject; let but the tail of your eye catch ‘oxygenation’ on a page, and the well-trained organ skips that paragraph of its own accord. No need to tell Macaulay’s schoolboy, or anybody else, how the blood of the body is brought to the lungs and there spread about in a huge extent of innumerable ‘pipes’ that it may be exposed momentarily to the oxygen in the air; how the air is made to blow upon the blood, so spread out in readiness, by the bellow-like action of breathing; how the air penetrates the very thin walls of the pipes; and then, behold, a magical (or chemical) transmutation; the worthless sewage of the system becomes on the instant the rich vivifying fluid whose function it is to build up the tissues of muscle and nerve. And the Prospero that wears the cloak? Oxygen, his name; and the marvel that he effects within us some fifteen times in the course of a minute is possibly without parallel in the whole array of marvels which we ‘tot up’ with easy familiarity, setting down ‘life,’ and carrying – a cypher!