CONTENTS. 



II. 

 The Part plated by Worms in the History or this Planet. 



They preserve Valuable Ruins 

 They prepare the Ground for Seed 

 Intelligence of Worms 



42 

 43 

 45 



III. 



The Laws of Variability with respect to Animals and Plants. 

 Inherited Effect of Changed Ilabits 

 Effects of the Use and Disuse of Parts 

 Vague Origin of our Domestic Animals . 

 Descent of the Domestic Pigeon 

 Origin of the Dog ..... 

 Origin of the Horse .... 

 Causes of Modifications in the Horse 



* 



r 



"Making the Works of Cod a mere Mockery" 



Variability of Cultivated Plants . 



Savage Wisdom in the Cultivation of Plants . 



Unknown Laws of Inheritance 



Laws of Inheritance that are fairly well established 



Inherited Peculiarities in Man 



Inherited Diseases .... 



Causes of Non-Inheritance 



Steps by which Domestic Paces have been produced 



Unconscious Selection .... 



Adaptation of Animals to the Fancies of Man 



Doubtful Species ..... 



Species an Arbitrary Term __. __. . 



The True Plan of "Creation - 



IV. 



The Struggle for Existence. 

 Death inevitable in the Fight for Life 

 " Inexplicable on the Theory of Creation " 

 Obscure Checks to Increase .... 

 Climate as a Check to Increase .... 

 Influence of Insects in the Struggle for Existence 

 No such Thing as Change in the Result of the Struggle . 



48 

 50 

 52 

 53 

 55 

 57 

 58 

 59_J 



61 

 . 62 



64 

 . 66 



67 

 . 68 



69 

 . 71 



73 

 . 74 



75 

 . 7 7 



84 

 85 

 86 

 88 

 90 



