Excerpt from Common Science A collection of about 2000 questions asked by children forms the foundation on which this book is built. Rather than decide what it is that children ought to kw, or what kwledge could best be fitted into some educational theory, an attempt was made to find out what children want to kw. The obvious way to discover this was to let them ask questions. The questions collected were asked by several hundred children in the upper elementary grades, over a period of a year and a half. They were then sorted and classified according to the scientific principles needed in order to answer them. These principles constitute the skeleton of this course. The questions gave a very fair indication of the parts of science in which children are most interested. Physics, in simple, qualitative form, - t mathematical physics, of course, - comes first; astromy next; chemistry, geology, and certain forms of physical geography (weather, volcaes, earthquakes, etc.) come third; biology, with physiology and hygiene, is a dose fourth; and nature study, in the ordinary school sense of the term, comes in hardly at all. The chapter headings of this book might indicate that the course has to do with physics and chemistry only. This is because general physical and chemical principles form a unifying and inclusive matrix for the mass of applications. But the examples and descriptions throughout the book include physical geography and the life sciences. Descriptive astromy and geology have, however, been omitted. These two subjects can be best grasped in a reading course and field trips, and they have been incorporated in separate books. 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 techlogy 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.