An Essay Towards a New Theory of Vision | Page 2

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 tangible magnitude 64 The judgments we make of magnitude depend altogether on experience 65 Distance and magnitude seen as shame or anger 66 But we are prone to think otherwise, and why 67 The moon seems greater in the horizon than in the meridian 68 The cause of this phenomenon assigned 69 The horizontal moon, why greater at one time than another. 70 The account we have given proved to be true 71 And confirmed by the moon's appearing greater in a mist 72 Objection answered 73 The way wherein faintness suggests greater magnitude illustrated 74 Appearance of the horizontal moon, why thought difficult to explain 75 Attempts towards the solution of it made by several, but in vain 76 The opinion of Dr. Wallis 77 It is shown to be unsatisfactory 78 How lines and angles may be of use in computing apparent magnitudes 79 One born blind, being made to see, what judgment he would make of magnitude 80 The MINIMUM VISIBLE the same to all creatures 81 Objection answered 82 The eye at all times perceives the same number of visible points 83 Two imperfections in the VISIVE FACULTY 84 Answering to which, we may conceive two perfections 85 In neither of these two ways do microscopes improve the sight 86 The case of microscopical eyes, considered 87 The sight, admirably adapted to the ends of seeing 88 Difficulty concerning erect vision 89 The common way of explaining it 90 The same shown to be false 91 Not distinguishing between IDEAS of sight and touch, cause of mistake in this matter 92 The case of one born blind, proper to be considered 93 Such a one might by touch attain to have IDEAS of UPPER and LOWER 94 Which modes of situation he would attribute only to things tangible 95 He would not at first sight think anything he saw, high or low, erect or inverted 96 This illustrated by an example 97 By what means he would come to denominate visible OBJECTS, high or low, etc. 98 Why he should think those OBJECTS highest, which are painted on the lowest part of his eye, and VICE VERSA 99 How he would perceive by sight, the situation of external objects 100 Our propension to think the contrary, no argument against what has been said 101 Objection 102 Answer 103 An object could not be known at first sight by the colour 104 Nor by the magnitude thereof 105 Nor by the figure 106 In the first act of vision, no tangible thing would be suggested by sight 107 Difficulty proposed concerning number 108 Number of things visible, would not at first sight suggest the like number of things tangible 109 Number the creature of the mind 110 One born blind would not at first sight number visible things as others do 111 The situation of any object determined with respect only to objects of the same sense 112 No distance, great or small, between a visible and tangible thing 113 The not observing this, cause of difficulty in erect vision 114 Which otherwise includes nothing unaccountable 115 What is meant by the picture being inverted 116 Cause of mistake in this matter 117 Images in the eye, not pictures of external objects 118 In what sense they are pictures 119 In this affair we must carefully distinguish between ideas of sight and touch 120