escaping to the front; and again the muscle called the nictitating membrane is transparent, because, if the eye had not such a screen, they could not keep it open against the wind which strikes against the eye in the rush of their rapid flight. And the pupil of the eye dilates and contracts as it sees a less or greater light, that is to say intense brilliancy.
831.
If at night your eye is placed between the light and the eye of a cat, it will see the eye look like fire.
Remarks on the organs of speech
(832. 833).
832.
a e i o u ba be bi bo bu ca ce ci co cu da de di do du fa fe fi fo fu ga ge gi go gu la le li lo lu ma me mi mo mu na ne ni no nu pa pe pi po pu qa qe qi qo qu ra re ri ro ru sa se si so su ta te ti to tu
The tongue is found to have 24 muscles which correspond to the six muscles which compose the portion of the tongue which moves in the mouth.
And when a o u are spoken with a clear and rapid pronunciation, it is necessary, in order to pronounce continuously, without any pause between, that the opening of the lips should close by degrees; that is, they are wide apart in saying a, closer in saying o, and much closer still to pronounce u.
It may be shown how all the vowels are pronounced with the farthest portion of the false palate which is above the epiglottis.
833.