or whether they have a verticity about their own centres that produces the idea of whiteness in us; this is certain, that the more particles of light are reflected from a body, fitted to give them that peculiar motion which produces the sensation of whiteness in us; and possibly too, the quicker that peculiar motion is,-the whiter does the body appear from which the greatest number are reflected, as is evident in the same piece of paper put in the sunbeams, in the shade, and in a dark hole; in each of which it will produce in us the idea of whiteness in far different degrees.
12. Globuluak izan ala ez, edo gure baitan zuritasunaren ideia eragiten duena euren zentroen inguruan globulu horiek egiten duten jirabira izan ala ez, hau behintzat egia da, hots, zenbat eta partikula gehiago islatu gugana partikuloi zuritasun sentipen hori eragiten duen higidura emateko egokia den gorputz batetik, eta agian baita ere zenbat eta azkarrago izan higidura berezi hori, orduan eta zuriago agertuko dela kopuru handiagoa islatzen duen gorputza, eguzki izpien pean, itzalean eta zulo ilun batean ipinitako paper zatian nabari ikusten den bezala, hauetako bakoitzean maila oso ezberdinetako zuritasunaren ideia eragiten baitigu.