Excerpt from An Elementary Book on Electricity and Magnetism and Their Applications: A Text-Book for Manual Training Schools and High Schools, and a Manual for Artisans, Apprentices, and Home Readers The masters Of the theory and Of the practice Of teaching, from the sixteenth century to the present, have held that all intellectual acquire ment must come to us through the senses, and that we can reason upon the abstract only by reaching out from the concrete which is already grasped. Moreover, elementary instruction should be made interesting to the pupils, and the matter should be presented in an order and in a manner which will result in the readiest and most complete assimilation. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.