was devastated by measles; other barbarians by small-pox. Negroes have
acquired, through severe natural selection, a certain degree of
immunisation in America; but even now it is said that 'every other negro
dies of consumption.' There are, however, two races, both long
accustomed to town-life under horribly insanitary conditions, which have
shown that they can live in almost any climate. These are the Jews and
the Chinese. The medieval Ghetto exterminated all who were not naturally
resistant to every form of microbic disease; the modern Jew, though
often of poor physique, is hard to kill. The same may be said of the
Chinaman, who, when at home, lives under conditions which would kill
most Europeans.

The other factor, which is really promoting the gradual disappearance of
the Anglo-Saxons from the United States, is of a very different
character. The descendants of the old immigrants are on the whole the
aristocracy of the country. Now it is a law which hardly admits of
exceptions, that aristocracies do not maintain their numbers. The ruling
race rules itself out; nothing fails like success. Gibbon has called
attention to the extreme respect paid to long descent in the Roman
Empire, and to the strange fact that, in the fourth century, no
ingenuity of pedigree makers could deny that all the great families of
the Republic were extinct, so that the second-rate plebeian family of
the Anicii, whose name did appear in the Fasti, enjoyed a prestige far
greater than that of the Howards and Stanleys in this country. Our own
peerage consists chiefly of parvenus. Only six of our noble families, it
is said, can trace their descent in the male line without a break to the
fifteenth century. The peerage of Sweden tells the same tale. According
to Gallon, the custom or law of primogeniture, combined with the habit
of marrying heiresses who, as the last representatives of dwindling
families, tend to be barren, is mainly responsible for this. Additional