2. What is the physician’s duty to the family of a syphilitic patient? It is our firm conviction that it is the duty of every physician to his syphilitic patient, to the patient’s family, and to the community, to examine the mate and the children for evidence of syphilis acquired or congenital and to offer treatment if it is found to be needed. This is one of the chief means at our disposal today to prevent the late disasters of syphilis, acquired or congenital, for by such examinations the syphilitic condition is discovered before lesions have occurred which are irreparable. We know that the mate and children of a syphilitic patient have been exposed to syphilitic involvement, and it is our duty as physicians in possession of such knowledge, and as guardians of the public health, to investigate such cases, so that if they be found to have syphilis, steps may be taken to treat them early. 3. How much danger is there of causing unhappiness and breaking up families by this procedure? This question offers a chance for many theoretical answers. The facts are, however, that in doing this as a routine for nearly three years and examining several hundred families, there has been no instance to our knowledge in which a family has been broken up or grave difficulties have been encountered by this procedure. 4. In what percentage are the mates or children of neurosyphilitics found to show definite symptoms of syphilis? It is our opinion that the situation in regard to neurosyphilitics is the same as for syphilitics in general: That the same laws of attenuation of virus, and of chance occur here as elsewhere. Just as this book is going to press, we have learned that the distraught Mr. Jacobs, still desirous of starting a home for himself and feeling entirely well, consulted a physician. This physician took a sample of blood and had it tested at a competent laboratory, which reported the blood negative. On the strength of this test, the physician felt himself warranted in recommending, or at least not advising against, Mr. Jacobs’ marriage, which has probably now taken place.