Food and Flavor: A Gastronomic Guide to Health and Good Living by Henry T. Finck

4. It is, furthermore, an apparatus for filtering the air on its way

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to the lungs, which is done with the aid of fine hairs and _cilia_ in the nostrils. Persons who breathe through the mouth have at the age of thirty a gramme of dust in their lungs which they can never get rid of. Mouth-breathing is a cause of catarrh, of unrefreshing sleep, of snoring. Moreover, in the words of Dr. T. R. French, "the habit of breathing through the mouth interferes with general nutrition. The subjects of this habit are usually anemic, spare and dyspeptic."