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graded, evening, primary, grammar, high, and normal schools, and several years' service in state and city superintendence. Though not so good as I would like to make it, this book is submitted with the hope that it may save some beginners from wasting time and efforts in unprofitable empirical experiments, and that some veteran teachers may find in it a confirmation of principles and methods arrived at in the course of their own life-work.

For criticisms and suggestions I am under special obligations to Professor George W. Minns, of Concord, Mass., and to John Muir, of California.


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