This book is the second edition and is part of The Scientist's Library, Biology and Medicine series, a collection of works stimulated by a recognition of the markedly diversified approaches to biological problems, and by a desire to provide authoritative information not only to the specialist in a particular field but to those whose main interests lie in other fields. Thus the books of this series are designed to emphasize introductory concepts and problems, to state the current status of the subject, and to clarify terminology and methods of approach.
Doctor Paul has directed the present work toward those who consider themselves amateur human ecologists or epidemiological clinicians. It is a treatise for clinical investigations, and is not intended for those whose interests are preeminently statistical.
The book is divided into three sections, the first part giving the historical and philosophical development of the epidemiological method. Epidemiology is defined as