found in the writings of his predecessors; the broad fact remains that,
since the publication and by reason of the publication of "The Origin of
Species" the fundamental conceptions and the aims of the students of living
Nature have been completely changed...But the impulse thus given to
scientific thought rapidly spread beyond the ordinarily recognised limits
of Biology. Psychology, Ethics, Cosmology were stirred to their
foundations, and 'The Origin of Species' proved itself to be the fixed
point which the general doctrine needed in order to move the world."

In the contributions to this Memorial Volume, some of the authors have more
especially concerned themselves with the results achieved by Darwin's own
work, while others pass in review the progress of research on lines which,
though unknown or but little followed in his day, are the direct outcome of
his work.

The divergence of views among biologists in regard to the origin of species
and as to the most promising directions in which to seek for truth is
illustrated by the different opinions of contributors. Whether Darwin's
views on the modus operandi of evolutionary forces receive further
confirmation in the future, or whether they are materially modified, in no
way affects the truth of the statement that, by employing his life "in
adding a little to Natural Science," he revolutionised the world of
thought. Darwin wrote in 1872 to Alfred Russel Wallace: "How grand is the
onward rush of science: it is enough to console us for the many errors
which we have committed, and for our efforts being overlaid and forgotten
in the mass of new facts and new views which are daily turning up." In the
onward rush, it is easy for students convinced of the correctness of their
own views and equally convinced of the falsity of those of their fellow-
workers to forget the lessons of Darwin's life. In his autobiographical
sketch, he tells us, "I have steadily endeavoured to keep my mind free so