Paul Niemeyer, Popular Science Monthly (1877)
“ A party which occupies a room for hours, breathing the same air, might be compared to a party of bathers drinking the water in which they bathe. The man who on the street cuts off from his lungs the "cold" air, is like a ruminant. If this literally true comparison were universally accepted and acted on, the number of cough-complaints would be reduced one-half. The patient must keep the window of his bedroom open. Night-air is fresh air without daylight; he who fears night-air is like a child who dreads darkness; the light in the room after the lamp is extinguished is also night-air. ”
