20 INTRODUCTION. 



nates nothing, yet he holds his own. If this 

 is natural and therefore necessarily right, 

 where can we put civilised man? He 

 has gone ahead, increasing beyond his 

 natural limits, and in doing so has often 

 brought trouble upon himself. He has 

 preserved the unfit and must take the 

 consequences. 



I have indicated in some of my chapters 

 the lines on which species develop so as to 

 hold their own, but there is unfortunately 

 no example of one having gained the mastery. 

 It has been left to the animal with the most 

 perfect brain to work out this great problem. 

 "God made the country, man made the 

 town " is a truism which one who visits the 

 slums can appreciate. Is this sort of thing 

 to go on ? Or, shall we ultimately make 

 New York and London into Garden Cities? 

 With all their care bees suffer from several 

 pests, yet their arrangements for cleanliness 

 and ventilation are better than those of many 



