Contents 



VI. KVMI I TIMN GOIMJ <>N 183 



iutionary pro.xpert for man The fountain of change; vari- 

 ability Kxolution of plants Romance of wheat Changes in 

 animal lifr- Story of the salmon Forming new habits 

 rimcnts in locomotion; new devices. 



VII. Tin. DAWN OF Mixi> ...... 205 



A caution in regard to instinct A useful law Senses of fishes 



The mind of a minnow The mind and senses of amphibians 



Tin- reptilian mind Mind in birds Intelligence co-operat- 

 ing with instinct The mind of the mammal Instinctive 

 aptitudes Power of association Why is there not more intel- 

 ligence? The mind of monkeys Activity for activity's sake 



Imitation The mind of man Body and mind. 



VIII. FOUNDATIONS OF THE UNIVEBKE .... 



world of atoms The energy of atoms The discovery of 

 X rays The discovery of radium The discovery of the 

 Irctron The electron theory The structure of the atom 

 The new view of matter Other new views The nature of 

 electricity Electric current The dynamo Magnetism Ether 

 and waves Light What the blue "sky" means Light without 

 heat Forms of energy What heat is Substitutes for coal 

 Dissipation of energy What a uniform temperature would 

 mean Matter. ether, and Einstein The tides Origin of the 

 moon The earth slowing down The day becoming longer. 



