CONTENTS 



PAGE 



IX. THE WONDERS OF MICROSCOPY .... 297 



An invisible world of life Intricacy of vital architecture The 

 stones and mortar of the house of life The microcosm of the 

 cell The beginning of the individual Manifold uses of the 

 microscope The ultra-microscope Beauty of microscopic 

 structure. 



X. THE BODY-MACHINE AND ITS WORK . . . 315 



Traces of the past The ivory gates of the body The process 

 of digestion The vital fluid The heart How and why we 

 breathe Nerve messages The large machines of the body 

 The nervous system and the brain-centre The organs of 

 sense The discovery of hormones Mind and body 

 Emotions and digestion The cult of joy Healthy- 

 mindedness. 



XI. How DARWINISM STANDS TO-DAY . . . 363 



Universal acceptance of the evolution idea The factors in evo- 

 lution The essence of Darwinism Darwinism in process of 

 evolution The three problems of evolution As regards 

 variation Variations and modifications As regards heredity 

 Germinal continuity As regards selection Sexual selection 

 Conclusions. 



XII. NATURAL HISTORY. I. BIRDS .... 395 



The dawn of bird-life Flightless birds Flying birds The 

 flight of birds Speed and altitude The hunting of the pere- 

 grine The fishing of the cormorant The wisdom of the 

 raven Social life Mutual protection Interrelations The 

 nightingale The blackbird and the song-thrush The hawk 

 The woodpigeon The bullfinch and the goldfinch A few 

 woodlanders The waterhen and the coot The grebes 



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