FINAL REMARKS 499 



vertebrate kingdom itself, but the origin of the vertebrate from the 

 most highly-developed invertebrate race. 



The study of the comparative anatomy of organs down to the 

 finest details has always been a most important aid in finding out 

 relationship between animals or groups of animals. My theory 

 endorses this view to the uttermost, and especially indicates the 

 study of the central nervous system and its outgoing nerves as that 

 comparative study which is most likely to afford valuable results. 



As for the individual, so for the nation ; as for the nation, so for 

 the race ; the law of evolution teaches that in all cases brain-power 

 wins. Throughout, from the dawn of animal life up to the present 

 day, the evidence given in this book suggests that the same law 

 has always held. In all cases, upward progress is associated with 

 a development of the central nervous system. 



The law for the whole animal kingdom is the same as for the 

 individual. " Success in this world depends upon brains." 



