Excerpt from A Text-Book in Physics for Secondary Schools The treatment of Heat is unusually full of principles and their applications. The relative importance of this subject, in its rela tions both to the life of the pupil and to his work in other sciences, justifies this plan. The discussion of Sound, the least important of all the subdivisions, is much shorter than that usually given, yet it offers all that is of any considerable value to people gener ally. 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.