She must cooperate with her doctor whose associate she is and secure the confidence of her patient who relies upon her for guidance in the perils she is facing. For childbirth is a peril. It is no longer the normal process it once was. Civilization has changed the shape of the pelvic bones, altered the muscles of parturition and weakened the nerve centers that control the event. The birth of a child is equal in severity and seriousness to many of the major operations. It is not an affair to be entered upon lightly nor managed without the utmost foresight and care. The dangers that are recognized and prepared for in this book by what may seem to some to be an extravagant technic, are very real dangers, extremely subtle, and against them at times every precaution and every defense proves unavailing. Nevertheless, skill, thoughtfulness, and above all, cleanliness, will avert the worst, as well as unhappily the most common of these disasters. If our nurses could be convinced of this, the difficulties and apprehensions of childbirth would be greatly diminished. The nurse should see to it that her patient is surrounded by all the precautions and safeguards against infection that she would demand for a member of her own family. This means of course that her work will be far more exacting and onerous but also it will save many nights of anxiety and not infrequently a life. This book represents the obstetric ideas and technic which the writer has endeavored for years to impress upon his students and nurses with such emendations and changes as experience and scientific progress have suggested. It is a selective essence distilled from the recurrent harvests that workers in this field have brought forth during centuries of consecrated effort. To all these forerunners the writer acknowledges a deep personal indebtedness. In the preparation of the book thanks are due particularly to Charlotte Gregory, Head Nurse of the Wesley Maternity, whose rare ability as teacher, technician and executive and whose untiring vigilance has been a leading factor in securing and maintaining the high state of efficiency in this department. She has kindly contributed Chapters XXIII and XXIV, together with valuable suggestions and criticisms in other portions of the text. The author also takes pleasure in acknowledging his obligations to Florence Olmstead, Head Nurse of the Dispensary of the Northwestern University Medical School, whose long experience in feeding babies gives to her words an unquestioned authority. Chapter XXII is almost entirely her work. To the various publishers who have courteously allowed the reproduction of valuable illustrations from the books of other writers thanks are also extended, and to his own publishers especially for their cordial and sympathetic cooperation the author wishes to express his warmest gratitude. C. B. R. Chicago, 1917.