"What I want to do now (1885) is to connect vibrations not only with
memory but with the physical constitution of that body in which the
memory resides, thus adopting Newland's law (sometimes called
Mendelejeff's law) that there is only one substance, and that the
characteristics of the vibrations going on within it at any given
time will determine whether it will appear to us as, we will say,
hydrogen, or sodium, or chicken doing this, or chicken doing the
other." [This is touched upon in the concluding chapter of "Luck or
Cunning?" 1887].

The present edition of "Life and Habit" is practically a re-issue of
that of 1878. I find that about the year 1890, although the original
edition was far from being exhausted, Butler began to make
corrections of the text of "Life and Habit," presumably with the
intention of publishing a revised edition. The copy of the book so
corrected is now in my possession. In the first five chapters there
are numerous emendations, very few of which, however, affect the
meaning to any appreciable extent, being mainly concerned with the
excision of redundancies and the simplification of style. I imagine
that by the time he had reached the end of the fifth chapter Butler
realised that the corrections he had made were not of sufficient
importance to warrant a new edition, and determined to let the book
stand as it was. I believe, therefore, that I am carrying out his
wishes in reprinting the present edition from the original plates. I
have found, however, among his papers three entirely new passages,
which he probably wrote during the period of correction and no doubt
intended to incorporate into the revised edition. Mr. Henry Festing
Jones has also given me a copy of a passage which Butler wrote and
gummed into Mr. Jones's copy of "Life and Habit." These four
passages I have printed as an appendix at the end of the present