Preface
The will of John Calvin McNair established a Foundation at the University of North Carolina upon which public lectures are to be given from time to time to the members of the University. This book contains three lectures which were given in February of this year upon this Foundation. It is a pleasure to acknowledge the many courtesies enjoyed during my brief stay at Chapel Hill, the seat of the University.
J. D.
Columbia University,
New York City, April, 1915.