V. When the fluid part of the human body is determined by an external body to impinge often on another soft part, it changes the surface of the latter, and, as it were, leaves the impression thereupon of the external body which impels it.
V. Giza Gorputzaren alde isurkor bat kanpoko gorputz batek determinatzen duelarik beste alde mardo baten maiz jotzera, alde honen azala aldatzen da eta honek hartzen ditu jotzen duen kanpoko gorputzaren hatzak.