_THE PRACTICE OF OBSTETRICS. In Original Contributions by American Authors. Edited by Reuben Peterson, A.B., M.D., Professor of Obstetrics and Gynecology in the University of Michigan, Ann Arbor, Mich.; Obstetrician-in-Chief to the University of Michigan Hospital. Lea Bros. and Co., Philadelphia and New York, 1907._ In marked contrast to the comparatively slight interference of pregnancy with the course of syphilis is the decidedly unfavorable influence of syphilis upon the course of pregnancy. Syphilis, more often than any other infectious disease, is responsible for a great variety of pathological changes in the fetus, placenta and uterus, and for the premature interruption of gestation. Statistics show that the fetal mortality in this disease averages 50%. This figure is lower than that given in the preceding paragraphs for some of the acute infectious diseases, but considering the prevalence of syphilis among all civilized and uncivilized races, it is obvious that the effect of this disease deserves a most careful consideration, not only from the medical, but also from the economic and sociologic point of view. Fournier gives the fetal mortality for cases in which the maternal infection occurs simultaneously with fecundation as 75%, the fetal morbidity being above 91%. Page 347. (Hugo Ehrenfest, M.D.) _A TEXT BOOK OF OBSTETRICS. Barton Cooke Hirst, M.D., Professor of Obstetrics in the University of Pennsylvania; Gynecologist to the Howard and Orthopaedic and Philadelphia Hospitals, etc. W. B. Saunders Co., Philadelphia and London, 1912._ Syphilitis as the most frequent cause of habitual death of the fetus must be excluded before another cause is sought. P. 352. Of 657 pregnancies in syphilitic women collected by Charpentier 35% ended in abortion, and of the children that went to term a large number were stillborn. Of 100 conceptions in syphilitic women only seven children were alive a year later. P. 333. _PRACTICAL OBSTETRICS. Thomas Watts Eden, Obstetrical Physician and Lecturer on Midwifery and Gynecology, Charing Cross Hospital; Consulting Physician to Queen Charlotte’s Lying-in-Hospital; Surgeon to In-Patient Hospital for Women. 4th Edition. C. V. Mosby Co. 1915._ Of all the systematic causes of abortion however, the most important in all respects is syphilis. In all probability more abortions are due to this disease than to any other cause. P. 220.