Dr. Boudin, the eminent physiologist and medical writer, remarks that the Jew is governed by statistical laws of birth, sickness, and mortality completely different from those which rule the peoples amongst whom he lives. This assertion is confirmed by the testimony of history. During the Middle Ages, when the unclean capitals of Europe and Asia were periodically devastated by the plague, the angel of death passed by the houses of the oppressed and despised Jews, although they were condemned by local regulations to occupy the worst quarters of the cities. In speaking of the pestilence of A.D. 1345, Tschudi says that it nowhere attacked the Jews. Frascator mentions that they completely escaped the typhus epidemic in A.D. 1505; they were untouched by the intermittent fevers which reigned in Rome in A.D. 1691; they were not subject to the dysentery which was so fatal at Nimeguen in A.D. 1736; and both in 1832 and 1849 it is stated upon excellent authority that they enjoyed comparative exemption from the cholera in London, although during the last-named year the city numbered nearly thirteen thousand victims.[8] Not less curious are the statistics showing the natural aptitude of the Jewish people, at once so national in their sentiments and so cosmopolitan in their tendencies, for universal acclimatization. The Jew and the Christian will emigrate to a British or a French colony from the same birthplace; and while, owing to the uncongenial climate, the Christian settler with his family eventually dies out, the Jewish settler increases and multiplies. In Algeria, for example, the French colonies would become extinct in a very short process of time were it not for the steady influx of immigrants, whereas the Jew takes deep root and throws out vigorous branches. With respect to the superior longevity of the Jews, German sources supply some interesting particulars. Dr. W. C. de Neufville,[9] of Frankfort, by the collection and collation of an immense mass of statistics, has demonstrated the following facts: 1. One-fourth of Christian populations dies at the mean age of 6 years 11 months. 2. One-fourth of Jewish populations dies at the mean age of 28 years 3 months. 3. One-half of Christian populations dies at the mean age of 36 years 6 months. 4. One-half of Jewish populations dies at the mean age of 53 years 1 month. 5. Three-fourths of Christian populations die at the mean age of 59 years 10 months. 6. Three-fourths of Jewish populations die at the mean age of 71 years. It is found that in Prussia the annual mortality among the Jews is 1·61 per cent, to 2·00 among the rest of the population. The annual rate of increase with the former is 1·73 per cent.; with the latter only 1·36.[10] In Frankfort the mean duration of human life is 36 years 11 months among the Christian population, and 46 years 9 months among the Jewish.