Epidemiology though of ancient lineage has been enhanced in concept and scope in the ensuing years. Many books have been written which bear the imprint of epidemiology as a discipline which treats of the "natural history of disease," but until recent years these were limited to a consideration of infectious diseases. Frost was one of the earlier advocates of application of the science to the study of all diseases, and recent books on epidemiology have given deserved attention to the so-called chronic diseases. The sheer number of diseases to be covered practically precludes a complete opus on epidemiology so that most books on the subject treat of some facet of the discipline. The half-dozen or more books which have appeared during the past decade are no exception including the volume under review.
The title of this book indicates its principal thesis—methodology in epidemiology. Equipped with a proper training in microbiology