880 he continued the subject by publishing _Unconscious Memory_.
Chapter IV of this book is concerned with a personal quarrel between
himself and Charles Darwin which arose out of the publication by Charles
Darwin of Dr. Krause's _Life of Erasmus Darwin_. We need not enter into
particulars here, the matter is fully dealt with in a pamphlet, _Charles
Darwin and Samuel Butler_: _A Step towards Reconciliation_, which I wrote
in 1911, the result of a correspondence between Mr. Francis Darwin and
myself. Before this correspondence took place Mr. Francis Darwin had
made several public allusions to _Life and Habit_; and in September,
1908, in his inaugural address to the British Association at Dublin, he
did Butler the posthumous honour of quoting from his translation of
Hering's lecture "On Memory," which is in _Unconscious Memory_, and of
mentioning Butler as having enunciated the theory contained in _Life and
Habit_.

In 1886 Butler published his last book on evolution, _Luck or Cunning as
the Main Means of Organic Modification_? His other contributions to the
subject are some essays, written for the _Examiner_ in 1879, "God the
Known and God the Unknown," which were republished by Mr. Fifield in
1909, and the articles "The Deadlock in Darwinism" which appeared in the
_Universal Review_ in 1890 and some further notes on evolution will be
found in _The Note-Books of Samuel Butler_ (1912).

It was while he was writing _Life and Habit_ that I first met him. For
several years he had been in the habit of spending six or eight weeks of
the summer in Italy and the Canton Ticino, generally making Faido his
headquarters. Many a page of his books was written while resting by the
fountain of some subalpine village or waiting in the shade of the
chestnuts till the light came so that he could continue a sketch. Every
year he returned home by a different route, and thus gradually became
acquainted with every part of the Canton and North Italy. There is
scarcely a town or village, a point of view, a building, statue or
picture in all this country with which he was not familiar. In 1878 he
happened to be on the Sacro Monte above Varese at the time I took my
holiday; there I joined him, and nearly every year afterwards we were in
Italy together.

He was always a delightful companion, and perhaps at his gayest on these
occasions. "A man's holiday," he would say, "is his garden," and he set
out to enjoy himself and to make everyone