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 draughtsman's skill, or at any rate your memory afterwards, to establish the outline of anything that comes.'

He waited for the answer, still keeping his face uncomfortably close.

Henriot drew back a little. But his mind was fully made up now. He had known from the beginning that he would consent, for the desire in him was stronger than all the caution in the world. The Past inexorably drew him into the circle of these other lives, and the little human dread Vance woke in him seemed just then insignificant by comparison. It was merely of Today.

'You two,' he said, trying to bring judgment into it, 'engaged in evocation, will be in a state of clairvoyant vision. Granted. But shall I, as an outsider, observing with unexcited mind, see anything, know anything, be aware of anything at all, let alone the drawing of it?'

'Unless,' the reply came instantly with decision, 'the descent of Power is strong enough to take actual material shape, the experiment is a failure. Anybody can induce subjective vision. Such fantasies have no value though. They are born of an overwrought imagination.' And then he added quickly, as though to clinch the matter before caution and hesitation could take effect: 'You must watch from the heights above. We shall be in the valley⁠—the Wadi Hof is the place. You must not be too close⁠'

'Why not too close?' asked Henriot, springing forward like a flash before he could prevent the sudden impulse.

With a quickness equal to his own, Vance answered. There was no faintest sign that he was surprised. His self-control was perfect. Only the