NATURE round corners which look as if they were sharp angles, is so strikingly unlike anything which can be realized (and the results explained in this section can to a great extent be experimentally realized), that the diagram becomes at least misleading. If the corners are sharp by intention, then the diagram is absolutely wrong. In spite of the faults and defects we have been obliged to notice, this book is, as we have said, an admirable attempt at a very worthy object, and with some

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... ing it can be made into an excellent text-book. We wish it ail success, feeling well satisfied that it meets a decided want.