PREFACE The greatest duty of mankind lies in the proper uprearing of our children. The fact is recognized, but is the duty fulfilled? Do we rear our children as we should? There is but one answer: We fail. Teaching them many things for their good, we yet keep from them ignorantly, foolishly, with a hesitancy and neglect unpardonable—knowledge, the possession of which is essential for their future welfare. The first necessity for... more...