Introduction 



come to light, principally owing to the inves- 

 tigations 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 re- 

 quired. 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, 

 " II 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 



