Excerpt from Wells's Natural Philosophy: For the Use of Schools, Academies, and Private Students; Introducing the Latest Results of Scientific Discovery and Research; Arranged With Special Reference to the Practical Application of Physical Science to the Arts and the Experiences of Every-Day Lif Thus, when we speak of the theory of heat, or of electricity, we have reference to a general consideration of the whole subject of heat, or light, or electricity; but when we use the expression a law of heat, Of light, or of electricity, we have reference to a particular department of the whole subject. 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.