Some obstruction to labor in the small size or abnormal shape of the pelvic canal causes many deaths of mothers included in the class “other accidents of labor” and also many stillbirths. If such difficulty is discovered before labor, proper treatment will in almost all cases insure the life of mother and child; if it is not discovered until labor has begun, or perhaps until it has continued for many hours, the danger to both is greatly increased. Every woman, therefore, should have during pregnancy—and above all during her first pregnancy—an examination in which measurements are made to enable the physician to judge whether or not there will be any obstruction to labor. A case in which a complication of this kind is found requires the greatest skill and experience in treatment, but with such treatment the life and health of the mother are almost always safe. _PRINCIPLES AND PRACTICE OF OBSTETRICS. Jos. B. De Lee, M.D., Professor of Obstetrics at the Northwestern University Medical School; Obstetrician to the Chicago Lying-in-Hospital and Dispensary, and to Wesley and Mercy Hospitals, etc. W. B. Saunders Co. 1913._ No subject in medicine presents greater difficulties in all its aspects than this one, (treatment of contracted pelves) and none demands such art or practical skill. Science aids little here. P. 709. Outside factors must also be considered: 1—The environment, whether the parturient is in a squalid tenement, in the country, in a home where every appliance is attainable, or in a well equipped maternity. 2—Whether in the hands of a general practitioner or a trained specialist. 3—If the patient is a Catholic, all medically indicated procedures not being permitted. 4—The age of the parturient, and the probability of her having more children. Even with these enumerations, the possible factors which might influence a labor, or our decision regarding the course to pursue have not all been mentioned. P. 709. _THE PRACTICE OF OBSTETRICS. Designed for the use of Practitioners and Students of Medicine. J. Clifton Edgar, Professor of Obstetrics and Clinical Midwifery in the Cornell University Medical College. Visiting Obstetrician to Bellevue Hospital, New York City; Surgeon to the Manhattan Maternity Dispensary; Consulting obstetrician to the New York Maternity and Jewish Maternity Hospitals. 5th Edition, Revised. P. Blakiston’s & Co., Phila._ A knowledge of the female bony pelvis is the very alphabet of obstetrical science, and the foundation of obstetrical art. This structure is most important since it is from the disproportion between its size and that of the fetus, or from its abnormal shape that many of the difficulties of labor arise.