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between his and our age? Would not the very technical terms be to him an unintelligible jargon, an abracadabra of meaningless sounds, and the very instruments and apparatuses used, but "miraculous" monstrosities? And suppose, for one instant, I were to describe to you the hues of those colour rays that lie beyond the so-called "visible spectrum" — rays invisible to all but a very few even among us; to explain, how we can fix in space any one of the so-called subjective or accidental colours — the complement, (to speak mathematically) moreover, of any other given colour of a dichromatic body (which alone sounds like an absurdity), could you comprehend, do you think, their optical effect or even my meaning? And, since you see them not, such rays, nor can know them, nor have you any names for them as yet in Science, if I were to tell you: — "My good friend Sinnett, if you please, without moving from your writing desk, try search for, and produce before your eyes the whole solar spectrum decomposed into fourteen prismatic colours (seven being complementary), as it is but with the help of that occult light that you can see me from a distance as I see you" . . . . what think you, would be your answer? What would you have