The sphere of vision is equal whether I look onely in my hand or on the open firmament, for 1st, in both cases the retina is full; 2d, the radius's of both spheres are equall or rather nothing at all to the sight; 3dly, equal numbers of points in one & t'other.
In the Barrovian case purblind would judge aright.
Why the horizontal moon greater?
Why objects seen erect?
N.
To what purpose certain figure and texture connected wth other perceptions?
Men estimate magnitudes both by angles and distance. Blind at 1st could not know distance; or by pure sight, abstracting from experience of connexion of sight and tangible ideas, we can't perceive distance. Therefore by pure sight we cannot perceive or judge of extension.
Qu. Whether it be possible to enlarge our sight or make us see at once more, or more points, than we do, by diminishing the punctum visibile below 30 minutes?
I. S.