Introduction and Preface

"As this paper contains nothing which deserves the name either of experiment or discovery, and as it is, in fact, destitute of every species of merit, we should have allowed it to pass among the multitude of those articles which must always find their way into the collections of a society which is pledged to publish two or three volumes every year. . . . We wish to raise our feeble voice against innovations, that can have no other effect than to check the progress of science, and renew all those wild phantoms of the imagination which Bacon and Newton put to flight from her temple."--Opening Paragraph of a Review of Dr. Young's Bakerian Lecture. Edinburgh Review, January 1803, p. 450.

"Young's work was laid before the Royal society, and was made the 1801 Bakerian Lecture. But he was before his time. The second number of the Edinburgh Review contained an article levelled against him by Henry (afterwards Lord) Brougham, and this was so severe an attack that Young's ideas were absolutely quenched for fifteen years. Brougham was then only twenty-four years of age. Young's theory was reproduced in France by Fresnel. In our days it is the accepted theory, and is found to explain all the phenomena of light."--Times Report of a Lecture by Professor Tyndall on Light, April 27, 1880.

This Book
Is inscribed to
RICHARD GARNETT, ESQ.
(Of the British Museum)
In grateful acknowledgment of the unwearying kindness with which he has so often placed at my disposal his varied store of information.

NOTE:

For many years a link in the chain of Samuel Butler's biological works has been missing. "Unconscious Memory" was originally published thirty years ago, but for fully half that period it has been out of print, owing to the destruction of a large number of the unbound sheets in a fire at the premises of the printers some years ago. The present reprint comes, I think, at a peculiarly fortunate moment, since the attention of the general public has of late been drawn to Butler's biological theories in a marked manner by several distinguished men of science, notably by Dr. Francis Darwin, who, in his presidential address to the British Association in 1908, quoted from the translation of Hering's address on "Memory as a Universal 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