a few observers are learning that their life 

 also, with its faint suggestion of our own 

 primeval childhood, is one of intense human 

 interest. Some of them plan and calculate ; 

 and mathematics, however elementary, is 

 hardly a matter of instinct. Some of them 

 build dams and canals; some have definite 

 social regulations; some rescue 

 comrades; some bind their own 

 wounds, and even set a broken leg, 

 as will be seen in one of the fol- 

 lowing chapters. All higher orders 

 communicate more or less with each 

 other, and train their young, and 

 modify their habits to meet changing 

 conditions. These things, and many 

 more quite as wonderful, are also 

 facts. We are still waiting for the 

 naturalist who will tell us 

 truly what they mean. 



