There has been much discussion on the effects on the fetus in utero of medicine administered to the pregnant mother, and the opinions as to the reliability of this medication are so varied that we are in doubt as to a satisfactory conclusion. The effects of drugs administered and eliminated by the mammary glands and transmitted to the child at the breast are well known, and have been witnessed by nearly every physician, and, as in cases of strong metallic purges, etc., need no other than the actual test. However, scientific experiments as to the efficacy of fetal therapeutics have been made from time to time with varying results. Gusserow of Strasbourg tested for iodin, chloroform, and salicylic acid in the blood and secretions of the fetus after maternal administration just before death. In 14 cases in which iodin had been administered, he examined the fetal urine of 11 cases; in 5, iodin was present, and in the others, absent. He made some similar experiments on the lower animals. Benicke reports having given salicylic acid just before birth in 25 cases, and in each case finding it in the urine of the child shortly after birth. At a discussion held in New York some years ago as to the real effect on the fetus of giving narcotics to the mother, Dr. Gaillard Thomas was almost alone in advocating that the effect was quite visible. Fordyce Barker was strongly on the negative side. Henning and Ahlfeld, two German observers, vouch for the opinion of Thomas, and Thornburn states that he has witnessed the effect of nux vomica and strychnin on the fetus shortly after birth. Over fifty years ago, in a memoir on "Placental Phthisis," Sir James Y. Simpson advanced a new idea in the recommendation of potassium chlorate during the latter stages of pregnancy. The efficacy of this suggestion is known, and whether, as Simpson said, it acts by supplying extra oxygen to the blood, or whether the salt itself is conveyed to the fetus, has never been definitely settled.