Grateful acknowledgment is made to the authors and publishers who have generously permitted the use of extracts from modern books. Every one who has to do with either the history or the system of our law is under a debt to Professor Wigmore. Beyond this, however, I am indebted to him for several important suggestions. My colleague, Professor Joseph Warren, and Professor H. W. Humble, of the University of Kansas, have also assisted by valuable criticisms.
{{comment.content}}