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The houses of the grandmothers and great grandmothers of this generation, at least the country houses, with front door and back door always standing open, winter and summer, and a thorough draught always blowing through–with all the scrubbing, and cleaning, and polishing, and scouring which used to go on, the grandmothers, and still more the great grandmothers, always out of doors and never with a bonnet on except to go to church, these things entirely account for the fact so often seen of a great...