C. A. Ewald,[162] one of the most eminent of German professors of biology, gives us one of the most condensed statements on the subject of old age. He begins by contrasting the intense life of Berlin, where the lecture was given, with the fact that all paths lead to the door of death, which is nearest in war. The antique conception of death was youth with a reversed torch; the medieval, a skeletal mower taking pleasure in his work. The martyr’s love of death and even the passion for Nirvana are probably more or less pathological. If we assume 15,000 million people on the earth and a death rate of 30 million per year, we should have 81,192 deaths daily; 3,425, hourly; and 57 every minute. The baobab tree of Cape Verde shows a life of 5,000 years. Some have ascribed 500 to the swan. But nearly all data of great age are discredited. Even that of Parr (152), who married with potence at 120, and all the rest, are doubted. But the length of life is increasing. In Sweden, of every 100 children of five at the beginning of the last century, 27 reached 70; at the end of the century, 48 did so. In Bavaria the number increased from 25 to 40; in Germany, in the last twenty years, it increased from 30 to 39, so that we all have a better chance of living long than we would have had if we had been born a hundred years earlier. The average length of life in 1870 in Germany was 37 years and has now increased to 42½. In France and England it is 46 and in Norway and Sweden, 52. Cures of tuberculosis in the last twenty years have reduced the percentage of its victims from 31 to 17 per 10,000, and vaccination has reduced the death per million from smallpox to 5; while in Russia, where it is not compulsory, it is 520. _A priori_, death does not seem necessary and yet for even protozoa division often involves something like a very rudimentary corpse so that investigators like Götte, Hertwig, and Verworn accept the tenet of Weismann, with some slight reservation, if the corpse is to be taken as the criterion of death.