excerpt from "The Pleasures of Imagination:
................................Nor ever yet
104 The melting rainbow's vernal-tinctur'd hues
105 To me have shone so pleasing, as when first
106 The hand of Science pointed out the path
107 In which the sun-beams gleaming from the west
108 Fall on the watery cloud, whose darksome veil
109 Involves the orient; and that trickling shower
110 Piercing through every crystalline convex
111 Of clustering dew-drops to their flight oppos'd,
112 Recoil at length where concave all behind
113 The internal surface on each glassy orb
114 Repeals their forward passage into air;
115 That thence direct they seek the radiant goal
116 From which their course began; and, as they strike
117 In different lines the gazer's obvious eye,
118 Assume a different lustre, through the brede
119 Of colours changing from the splendid rose
120 To the pale violet's dejected hue.
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