vi Preface. 



and xxiii), and in four letters to Nature (vol. xli. 



p. 536 ; vol. xlii. pp. 28 and 369 ; and vol. xliv. 



p. 29). 



I have to thank Mr. Francis Galton, D.C.L., F.R.S. 



and Mr. F. Howard Collins for valuable assistance 



generously rendered for the sake of one whom all 



who knew him held dear. For he was, if I may 



echo the words of Huxley, " a friend endeared to 



me, as to so many others, by his kindly nature, and 



justly valued by all his colleagues for his powers 



of investigation and his zeal for the advancement of 



science." 



C. Lloyd Morgan. 

 Bristol, May 1897. 



