PREFACE. THE selected articles in this volume are confined to subjects of social welfare. There is one exception of a scientific character, in which an attempt is made to explain the causes of sleep. That paper was written many years ago, but it has required only a few sentences to bring it up to the knowledge which we now possess. The other articles are of a more recent date, and discuss subjects of national interest. I have carefully revised them so as to adapt the subject matter to the existing position of the important questions to which they relate. LYON PLAYFAIR. 68, ONSLOW Gardens, March, 1889. 99334 |