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Updated: May 1, 2025
Borne in countless numbers in its ever-ebbing and returning streams are little disks, flattened, bi-concave, not larger in man than one-three-thousandth of an inch in diameter, called red corpuscles, whose part it is to carry from the lungs to the tissues pure oxygen, without which the fire called life cannot be sustained, and back from the tissues to the lungs carbonic acid, one of the products of that fire; and larger, yet marvelously small, bodies called leucocytes or white corpuscles, whose precise origin and use to this day, in spite of all the labor that has been spent upon their study, remain unknown.
A human blood cell is about one-three-thousandth of an inch across, while a bacterial cell may be no more than one-twenty-five-thousandth of an inch in diameter. Yet, small as it is, the cell exhibits all of the customary phenomena of independent life; that is to say, it nourishes itself, it grows, it reproduces its kind, it moves about, and it feels.
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