section devoted to the sculptor represents all that Butler then knew
about Tabachetti, but since it was written various documents have
come to light, principally owing to the investigations of Cavaliere
Francesco Negri, of Casale Monferrato, which negative some of
Butler's most cherished conclusions. Had Butler lived he would
either have rewritten his essay in accordance with Cavaliere Negri's
discoveries, of which he fully recognised the value, or incorporated
them into the revised edition of "Ex Voto," which he intended to
publish. As it stands, the essay requires so much revision that I
have decided to omit it altogether, and to postpone giving English
readers a full account of Tabachetti's career until a second edition
of "Ex Voto" is required. Meanwhile I have given a brief summary of
the main facts of Tabachetti's life in a note (page 154) to the
essay on "Art in the Valley of Saas." Any one who wishes for
further details of the sculptor and his work will find them in
Cavaliere Negri's pamphlet, "Il Santuario di Crea" (Alessandria,
1902).

The three essays grouped together under the title of "The Deadlock
in Darwinism" may be regarded as a postscript to Butler's four books
on evolution, viz., "Life and Habit," "Evolution, Old and New,"
"Unconscious Memory" and "Luck or Cunning." An occasion for the
publication of these essays seemed to be afforded by the appearance
in 1889 of Mr. Alfred Russel Wallace's "Darwinism"; and although
nearly fourteen years have elapsed since they were published in the
Universal Review, I have no fear that they will be found to be out
of date. How far, indeed, the problem embodied in the deadlock of
which Butler speaks is from solution was conclusively shown by the
correspondence which appeared in the Times in May 1903, occasioned
by some remarks made at University College by Lord Kelvin in moving