“But don't I perceive that the relation between a lighter and a darker bit of material is a different one than that between the vowels e and u, – – as on the other hand I perceive that the relation between u and e is the same as that between e and i?” ‒ ‒ Under certain circumstances we shall in these cases be inclined to talk of different relations, under certain others to talk of the same relation. One might say, “It depends how
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one compares them.”