"Wholesome air is equally essential with wholesome food; hence it is that crowding individuals together in close, ill-ventilated apartments, as is often the case in boarding-schools, manufactories, and work-houses, is extremely prejudicial, both as a predisposing and exciting cause of tubercular disease." The great Baudeloque considers impure air the only real cause of scrofula, other causes assisting. He thinks that no scrofula could be developed without this cause, whatever others might be in operation. An English writer who was physician to the Princess Victoria says,--"There can be no doubt that the confined air of gloomy alleys, manufactories, work-houses, and schools, and of our nurseries and very sitting-rooms, is a powerful means of augmenting the hereditary predisposition to scrofula, and of inducing such a disposition _de novo_." To drink from the same tumbler, to eat from the same plate, to wear the same under-clothes, to wash in the same water, even with the cleanest of friends, would offend most people. But these are as alabaster whiteness and absolute purity, compared with the common practice of crowding into unventilated rooms, and thus sucking into the innermost parts of our vital organs the foulest secretions from each other's skins and lungs. I wish it were possible for these vile exhalations to be imbued with some dark color, if but temporarily. Then decency would join with reason in demanding a pure atmosphere. NIGHT AIR. Consumptives, and all invalids, and indeed persons in health, are cautioned to avoid the night air. Do those who offer this advice forget that there is no other air at night but "night air"? Certainly we cannot breathe day air during the night. Do they mean that we should shut ourselves up in air-tight rooms, and breathe over and over again, through half the twenty-four hours, the atmosphere we have already poisoned? We have only the choice between night air pure and night air poisoned with the exhalations from our skins and lungs, perhaps from lungs already diseased. A writer pertinently speaks on this point after the following fashion:--