[35]. This will be demonstrated in the [eleventh Chapter].
[36]. A fine net-work membrane in the bottom of the eye.
[37]. Book I. Art. 57.
[38]. A medium, in this sense, is any transparent body, or that through which the rays of light can pass; as water, glass, diamond, air; and even a vacuum is sometimes called a Medium.
[39]. Newton’s System of the World, p. 120.
[40]. This is evident from pumps, since none can draw water higher than 33 foot.
[41]. Namely 10000 times the distance of Saturn from the Sun; p. 94.
[42]. See his Astronomy, p. 232.
[43]. As far as one can see round him on the Earth.
[44].