... key is to the mechanical watch, air is to the physical man. Once admit air into the mouth and nostrils, and the lungs expand, the heart beats, the blood rushes to the remotest part of the body, the mouth secretes saliva, to soften and macerate the food; the liver forms its bile, to separate the nutriment from the digested aliment; the kidneys perform their office; the eye elaborates its tears, to facilitate motion and impart that glistening to the orb on which depends so much of its beauty; ... — The Book of Household Management • Mrs. Isabella Beeton
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