Westminster, and by almost every biologist and anthropologist of
distinction in Europe. Evolution is not a laboriously reached
conclusion, but a guiding truth, in biological literature to-day.

There was ample evidence to substantiate the conclusion even in the
first edition of the book. But fresh facts have come to light in each
decade, always enforcing the general truth of man's evolution, and at
times making clearer the line of development. Professor Haeckel
embodied these in successive editions of his work. In the fifth
edition, of which this is a translation, reference will be found to
the very latest facts bearing on the evolution of man, such as the
discovery of the remarkable effect of mixing human blood with that of
the anthropoid ape. Moreover, the ample series of illustrations has
been considerably improved and enlarged; there is no scientific work
published, at a price remotely approaching that of the present
edition, with so abundant and excellent a supply of illustrations.
When it was issued in Germany, a few years ago, a distinguished
biologist wrote in the Frankfurter Zeitung that it would secure
immortality for its author, the most notable critic of the idea of
immortality. And the Daily Telegraph reviewer described the English
version as a "handsome edition of Haeckel's monumental work," and "an
issue worthy of the subject and the author."

The influence of such a work, one of the most constructive that
Haeckel has ever written, should extend to more than the few hundred
readers who are able to purchase the expensive volumes of the original
issue. Few pages in the story of science are more arresting and
generally instructive than this great picture of "mankind in the
making." The horizon of the mind is healthily expanded as we follow
the search-light of science down the vast avenues of past time, and