The First Touch of Berkeley's Finger

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"Here [in Galileo] the character of the mind-dependent or merely phenomenal character of secondary qualities, as taught by Locke, is already full-grown. English students of philosophy, finding this doctrine in Locke, do not always realize that it is by no means an invention of his, but had been long ago taught by Galileo as an important truth, and was in fact one of the leading principles of the whole scientific movement of the preceding two centuries; and that by the time it reaches Locke it is already somewhat out of date, and ready to collapse at the first touch of Berkeley's finger." -- R. G. Collingwood, The Idea of Nature, p. 102

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