Note b — BOOK IV.
Reading edition
Although the Eye be the usual Judge of Colours, yet some have been able to distinguish them by their Feeling. Quidam fuit qui venit ad M. Duc. Hetruriæ aulam qui colores per Tactum cognoscebat. Pro experimento velum sericum, uniformiter textum, & pluribus coloribus tinctum, offerebatur, & veracitèr de colore to singulis partibus judicabat. Grimald. de Lum. & Col. prop. 43. §. 59.