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Rh think of actual echoes first. Suppose I repeat Tennyson's lines from the "Charge of the Light Brigade" in an even voice thus—

We might take that to represent the light of a star shining steadily, because I said the words in

an even monotonous way. But now let me say them to represent the way a new star blazes up suddenly— jaws of Death, from the mouth of Hell, All

You see I began faint and steady, because there seems to be generally a faint steady star which blazes out into a new one: then suddenly I mounted