They moved forward owing to the motion of their tails like that of a snake or an eel swimming in water; but in the somewhat thicker substance they would have to lash their tails at least 8 or 10 times before they could advance a hair's bredth. Sperm Counts: Overcome by Man's Most Precious Fluid - Page 25 by Lisa Jean Moore - 2008 - 214 pages Limited preview -
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