In February, 1876, partly to clear his mind and partly to tell someone, he wrote down his thoughts in a letter to his namesake, Thomas William Gale Butler, a fellow art-student who was then in New Zealand; so much of the letter as concerns the growth of his theory is given in _The Note- Books of Samuel Butler_ (1912). In September, 1877, when _Life and Habit_ was on the eve of publication, Mr. Francis Darwin came to lunch with him in Clifford's Inn and, in course of conversation, told him that Professor Ray Lankester had written something in _Nature_ about a lecture by Dr. Ewald Hering of Prague, delivered so long ago as 1870, "On Memory as a Universal Function of Organized Matter." This rather alarmed Butler, but he deferred looking up the reference until after December, 1877, when his book was out, and then, to his relief, he found that Hering's theory was very similar to his own, so that, instead of having something sprung upon him which would have caused him to want to alter his book, he was supported. He at once wrote to the _Athenaeum_, calling attention to Hering's lecture, and then pursued his studies in evolution. _Life and Habit_ was followed in 1879 by _Evolution Old and New_, wherein he compared the teleological or purposive view of evolution taken by Buffon, Dr. Erasmus Darwin, and Lamarck with the view taken by Charles Darwin, and came to the conclusion that the old was better. But while agreeing with the earlier writers in thinking that the variations whose accumulation results in species were originally due to intelligence, he could not take the view that the intelligence resided in an external personal God. He had done with all that when he gave up the Resurrection of Jesus Christ from the dead. He proposed to place the intelligence inside the creature ("The Deadlock in Darwinism," _post_). In 1880 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_.