He [ndr : un peintre] must not only have a nice Judgment to distinguish betwixt things nearly Resembling one another, but not the same […], but he must moreover have the same Delicacy in his Eyes to judge of the Tincts of Colours which are of infinite Variety ; and to distinguish whether a Line be streight, or curv’d a little ; whether This is exactly parallel to That, or oblique, and in what degree ; how This curv’d Line differs from That, if it differs at all, of which he must also judge ; whether what he has drawn is of the same Magnitude with what he pretends to imitate, and the like ; and must have a Hand exact enough to form these in his Work, answerable to the Ideas he has taken of them.