I truly appreciate the honor conferred on me by the Society in inviting me to deliver the fifth Charles Franklin Craig Lecture. This honor is appreciated not only on account of the high regard I entertain for Doctor Craig but also because the Society has complimented me by assuming that I may approach the high standard set by the four previous lecturers, to whom I have had the pleasure of listening.
In this paper no attempt will be made to present an adequate review of typhus fever since such a presentation would require many times the space and time permissible. Only those features of the disease will be mentioned which it is necessary to discuss in arriving at an understanding of the problems of control which face us today. With this in mind no effort has been made to make reference to all who have contributed to the voluminous literature dealing with typhus in recent years, mention being reserved for the work of those investigators whose contributions best illustrate the points under discussion at the moment.
National Institute of Health, U. S. Public Health Service.