uggest distance have in their own nature
no relation to it
29 A difficult case proposed by Dr. Barrow as repugnant to
all the known theories
30 This case contradicts a received principle in catoptrics
31 It is shown to agree with the principles we have laid down
32 This phenomenon illustrated
33 It confirms the truth of the principle whereby it is explained
34 Vision when distinct, and when confused
35 The different effects of parallel diverging and converging rays
36 How converging and diverging rays come to suggest the same
distance
37 A person extreme purblind would judge aright in the
forementioned case
38 Lines and angles, why useful in optics
39 The not understanding this, a cause of mistake
40 A query proposed, by Mr. Molyneux in his DIOPTRICS, considered
41 One born blind would not at first have any IDEA of distance by
sight
42 This not agreeable to the common principles
43 The proper objects of sight, not without the mind, nor the images
of any thing without the mind
44 This more fully explained
45 In what sense we must be understood to see distance
and external things
46 Distance, and things placed at a distance, not otherwise perceived
by the eye than by the ear
47 The IDEAS of sight more apt to be confounded with the IDEAS
of touch than those of hearing are
48 How this comes to pass
49 Strictly speaking, we never see and feel the same thing
50 Objects of SIGHT twofold, mediate and immediate
51 These hard to separate in our thoughts
52 The received accounts of our perceiving magnitude by sight, false
53 Magnitude perceived as immediately as distance
54 Two kinds of sensible extension, neither of which is
infinitely divisible
55 The tangible magnitude of an OBJECT steady, the visible not
56 By what means tangible magnitude is perceived by sight
57 This further enlarged on
58 No necessary connection between confusion or faintness
of appearance, and small or great magnitude
59 The tangible magnitude of an OBJECT more heeded than the visible,
and why
60 An instance of this
61 Men do not measure by visible feet or inches
62 No necessary connection between visible and tangible extension
63 Greater visible magnitude might signify lesser tan