We of the white race

From the blurb on the front cover:
Can the White Race survive? Is the question asked and conditionally answered by the author of this thought-provoking book on the incidence of biological and ideological factors in racial disintegration. Tracing the origin of the White Race to the hard conditions of the Last Ice Age in Europe, he asserts that for ten thousand years white men have been leaders of human progress, but have been weakened and obliterated wherever they have interbreed with colored races. The author’s warning is that, in the present epoch of history, the pressure of colored races may lead to the total destruction of white race civilization, unless white people everywhere combine to resist the destructive forces.