But the touch is equally diffused through the whole body, that we may not receive any blows, or the too rigid attacks of cold and heat, without feeling them.

And as in building the architect averts from the eyes and nose of the master those things which must necessarily be offensive, so has nature removed far from our senses what is of the same kind in the human body.
LVII.

What artificer but nature, whose direction is incomparable, could have exhibited so much ingenuity in the formation of the senses?
In the first place, she has covered and invested the eyes with the finest membranes, which she hath made transparent, that we may see through them, and firm in their texture, to preserve the eyes.

She has made them slippery and movable, that they might avoid what would offend them, and easily direct the sight wherever they will.

The actual organ of sight, which is called the pupil, is so small that it can easily shun whatever might be hurtful to it.