At the same time he knew that he was able to make this close contact endurable only by carefully directing his thoughts and actions--like the trick he had acquired of never quite looking at her directly. And he kept himself nerved up with the thought of what lay ahead, and his determination to regain what had been lost, and his hate. The present condition was only temporary. But if he once let himself start to think what it would mean to live a lifetime, to share bed and board, with that--blackness--coldness--vacancy. Other people noticed the difference all right. Like those crowds they'd had to push through in New York yesterday. Somehow people always edged away, so they wouldn't have to touch her, and he had caught more than one following glance, poised between curiosity and fear. And when that other woman started to scream--lucky they had been able to lose themselves in the crowd. The brief stopover at New York had provided him with some vitally necessary materials, though he still felt hampered by the lack of his library and notes. But he had been glad last night when it was over. The compartment seemed a haven of privacy. What was it those other people noticed? True, if you looked closely, the heavy cosmetics only provided a grotesque and garish contrast to the underlying pallor, and powder did not wholly conceal the ugly dark bruise around the mouth. But the veil helped, and you had to look very closely--the cosmetics were practically a theatrical make-up. Was it her walk that they noticed, or the way her clothes hung--her clothes always looked a little like a scarecrow's now, though you could not put your finger on the reason. Or was it-- But that was what he must not think about. * * * * * "Magic is a practical science." He talked to the wall, as if dictating. "There is all the difference in the world between a formula in physics and a formula in magic, although they have the same name. The former describes, in terse mathematical symbols, some cause-effect relationship of wide generality. But a formula in magic is a way of getting or accomplishing something. It always takes into account the motivation or desire of the person performing the magic--be it greed, love, revenge, or what-not. Whereas the experiment in physics is essentially independent of the experimenter. In short, there has been little or no "pure"--nonpractical--magic, comparable to pure science.