CONTEXTS. xi 



Natural Selection; or, the Survival of the Fittest. 

 ^L^An Invented Hypothesis . . . . • .93 



4 -jlow far the Theory may be extended .... 94 



Is there any Limit to what Selection can effect ? . . .96 



Has Organization advanced ? . . . .97 



A Higher Workmanship than Man's . . . . .99 



"Why Habits and Structure are not in Agreement . . 102 



Xo Modification in one Species designed for the Good of Another . 103 

 Illustrations of the Action of Xatural Selection . . . 106 



Divergence of Character . . . . . .108 



Evolution of the Human Eye . . . . .110 



VI. 



Geographical Distribution' of Organic Beings. 



Isolated Continents never were united . . . .115 



Means of Dispersal . . . . • .116 



These Means of Transport not accidental . . . .118 



DisDfursal during the Glacial Period . . . .119 



4 



Fhe Theory of C reation inadequate ..... 122 > 



Causes of a Glacial Climate . . . '. . 123 



Difficulties not yet removed ...... 124 



Identity of the Species of Islands with those of the Mainland ex- 

 plained only by this Theory . . . . .125 



TIL 



Evidence of the Descent of Man rnoM some Lower Form. 



f Points of Correspondence between Man and the other Animals . 129 



The facts of EmbryQLc^y_ajid_thgj Ticory o f Developm ent . 131 



Twr. Principles that jHcplain the Facts . . . . 134*^, 



Embryology against Abrupt Changes . . . ~. 135 

 Rudimentary Organs only to be explained on the Theory of De- 

 velopment ....... 137 



" Xo other Explanation has ever been given " . . . 139 



Unity of Type explained by Relationship .... 140 



/Inexplicable on the Ordinary View of Creation . . . 142 < 



Descent with Modification the only Explanation . . . 143 



I I 



