DARWIN. 135 



brought to light in the region of mental science." 1 These 

 truths are specified as the influence of natural selection in 

 the formation of instinct, in the " Origin of Species ; " 

 the evolution of mind and of morals, in the " Descent 

 of Man," considered by the late Professor Clifford as 

 containing the simplest and clearest and most profound 

 philosophy that was ever written on the subject; and 

 the evolution of expression in the book described in 

 this chapter. Thus, says Mr. Romanes, in respect both 

 of instincts and intelligence, the science of comparative 

 psychology may be said to owe its foundation to Darwin. 



1 G. J. Romanes, in " Charles Darwin," memorial notices reprinted 

 from Nature. 



