inference in the most unmistakable manner. I select a few examples in reference to the tuberculous diathesis, at once the most prevalent, the most liable to be transmitted, and, according to the prevailing opinion, the least amenable to preventive measures.
A quite old and widely known physician makes this statement: "My father and mother were cousins. Father had hæmoptysis at twenty-eight, and was supposed dying of consumption, but recovered, and died in his sixty-seventh year of cancer of the stomach. He had cicatrices in his lungs. Mother died of phthisis late in life, having given birth to six children. These are all alive. No consumption in any of them, nor in twenty-seven grandchildren and fourteen great grandchildren."
Another highly reputable physician writes: "On maternal side evident tendency to tuberculosis. My only brother—I had no sister—died of phthisis, aged twenty-six. I had hæmoptysis, with cough, repeatedly, between the ages of twenty-two and thirty-five. Wife healthy, and gave birth to five children—ages between thirty and forty-eight. None of them, nor eight grandchildren, have exhibited any signs of pulmonary consumption."
Another writes: "Consumption on father's side, having lost one if not two sisters by the disease. Mother died of it in her forty-third year. Six children were born to them—all alive and healthy, the youngest past his fiftieth year. They are all free from any signs of tuberculosis, as are also thirty-one grandchildren and eleven great grandchildren."
Yet another writes: "Father died of paralysis, mother of consumption; also one of her brothers. Grandmother also died of what is presumed to have been the same disease. Of seven children, varying from forty to sixty, none have shown any pulmonary disease."
These statements are made by physicians well known for their interest in sanitary science. Through their knowledge and influence, they and their kin have been able to take a wise advantage of the power of reversion. As there are hundreds of thousands throughout the land who have this fearful taint in their blood, a knowledge of the true conditions for its renovation becomes of great importance. It is not within the scope of this paper to enter upon details, but this much may be said, that intelligent and unwavering hygienic observances all through life, but especially from birth to adolescence, constitute the cardinal requisites. Not the hygiene, however, taught in almanacs, in gossipy newspapers, or by itinerant sensational lecturers, but by the most accomplished scientists. A thorough mastery of its principles and details, so as to secure a correct application of them at the various periods, emergencies, and contingencies of life, is absolutely necessary. In short, those with an unfortunate inheritance—like those suffering from an attack of disease—need the knowledge of an expert to enable them to take a wise and full advantage of the principle of re-
