Produced by Al Haines LESSONS ON SOIL BY E. J. RUSSELL, D.Sc. (Lond.) GOLDSMITH COMPANY'S SOIL CHEMIST, ROTHAMSTED EXPERIMENTAL STATION Cambridge: at the University Press 1911 [Transcriber's note: Page numbers in this book are indicated by numbers enclosed in curly braces, e.g. {99}. They have been located where page breaks occurred in the original book, in accordance with Project Gutenberg's FAQ-V-99. In the HTML version of this book, page numbers are placed in the left margin.] {v} PREFACE The Syndics of the Cambridge University Press propose to issue a Nature Study Series of which this is the first volume. We count ourselves fortunate in securing Dr E. J. Russell as author and Soil as subject. The subject is fundamental, for, just as the soil lies beneath the plant and animal life we see, so is a knowledge of the soil necessary for all understanding of flora and fauna. The real complexity of the apparently simple element "Earth," and the variety of methods required for exploring it, are typical of the problems which the _tout ensemble_ of the outdoor world presents to the naturalist. Dr E. J. Russell has not only acquired a first-rate and first-hand knowledge of his subject at Wye and at Rothamsted; his own researches have recently extended our knowledge of the micro-organisms in the soil and their influence on fertility. Further, what is very much to our purpose, he has himself had practical experience in teaching at an elementary school in Wye and at a secondary school in Harpenden. Just at the present moment, County Councils are trying to push rural education and to awaken the intelligence of country children by interesting them in their surroundings. It is, therefore, a favourable opportunity to offer these pages as a concrete suggestion in model lessons and object lessons, showing exactly what can be done under existing conditions. {vi} The book is intended to help children to study nature; there is no attempt to substitute book study for nature study. Hence, whilst there are passages of continuous reading, it is not a mere "reader." Many teachers, myself among them, have felt the difficulty of organising practical work for large classes. Dr Russell has written so that, whilst nominally showing the pupil how to learn, he is secretly scattering hints for the teacher who is learning how to teach.