Function of Original Matter," which Butler incorporated into
"Unconscious Memory," and spoke in the highest terms of Butler
himself. It is not necessary for me to do more than refer to the
changed attitude of scientific authorities with regard to Butler and
his theories, since Professor Marcus Hartog has most kindly consented
to contribute an introduction to the present edition of "Unconscious
Memory," summarising Butler's views upon biology, and defining his
position in the world of science. A word must be said as to the
controversy between Butler and Darwin, with which Chapter IV is
concerned. I have been told that in reissuing the book at all I am
committing a grievous error of taste, that the world is no longer
interested in these "old, unhappy far-off things and battles long
ago," and that Butler himself, by refraining from republishing
"Unconscious Memory," tacitly admitted that he wished the controversy
to be consigned to oblivion. This last suggestion, at any rate, has
no foundation in fact. Butler desired nothing less than that his
vindication of himself against what he considered unfair treatment
should be forgotten. He would have republished "Unconscious Memory"
himself, had not the latter years of his life been devoted to all-
engrossing work in other fields. In issuing the present edition I am
fulfilling a wish that he expressed to me shortly before his death.

R. A. STREATFEILD.
April, 1910.



INTRODUCTION By Marcus Hartog, M.A. D.Sc., F.L.S., F.R.H.S.