infusion of their blood among the Xanthochroi?

At present Palaeontology yields no safe data to the ethnologist. We
know absolutely nothing of the ethnological characters of the men of
Abbeville and Hoxne; but must be content with the demonstration, in
itself of immense value, that Man existed in Western Europe when its
physical condition was widely different from what it is now, and
when animals existed, which, though they belong to what is, properly
speaking, the present order of things, have long been extinct. Beyond
the limits of a fraction of Europe, Palaeontology tells us nothing of
man or of his works.

To sum up our knowledge of the ethnological past of man: so far as the
light is bright, it shows him substantially as he is now; and, when it
grows dim, it permits us to see no sign that he was other than he is
now.

It is a general belief that men of different stocks differ as much
physiologically as they do morphologically; but it is very hard
to prove, in any particular case, how much of a supposed national
characteristic is due to inherent physiological peculiarities, and
how much to the influence of circumstances. There is much evidence to
show, however, that some stocks enjoy a partial or complete immunity
from diseases which destroy, or decimate, others. Thus there seems
good ground for the belief that Negroes are remarkably exempt from
yellow fever; and that, among Europeans, the melanochrous people are
less obnoxious to its ravages than the xanthochrous. But many writers,
not content with physiological differences of this kind, undertake to
prove the existence of others of far greater moment; and, indeed, to
show that certain stocks of mankind exhibit, more or less distinctly,