Twenty years ago, in'the Preface to the First Edition, the principles upon which this textbook is based were briefly set forth. Since that time, wars and social convulsions, technology and science, have wrought great changes in the world, and so have changed in some degree the context in which the principles of a textbook like this must be applied. But only the context is changed; the principles are not. In its principles the art of rhetoric is not political, nor, in our modern relativist sense, can it ever b scientific. The more shifting the context, the greater the need for firmness as to principles. The criticism to which our educational practices are being subjected, from without and within the Grove of Academe, gives sharp contemporary emphasis to these truths.
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