For I Am Well Aware That Scarcely

Nothing Exists For Itself Alone, But Only In Relation To Other Forms Of Life

You Ask About My Opinion On Vivisection. I Quite Agree That It Is Justifiable For Real Investigations On Physiology; But Not For Mere Damnable And Detestable Curiosity.

This Fundamental Subject Of Natural Selection Will Be Treated At Some Length In The Fourth Chapter; And We Shall Then See How Natural Selection Almost Inevitably Causes Much Extinction Of The Less Improved Forms Of Life And Induces What I Have Called Divergence Of Character.

In The Distant Future I See Open Fields For Far More Important Researches. Psychology Will Be Based On A New Foundation, That Of The Necessary Acquirement Of Each Mental Power And Capacity By Gradation. Light Will Be Thrown On The Origin Of Man And His History.

As Many More Individuals Of Each Species Are Born Than Can Possibly Survive; And As, Consequently, There Is A Frequently Recurring Struggle For Existence, It Follows That Any Being, If It Vary However Slightly In Any Manner Profitable To Itself, Under The Complex And Sometimes Varying Conditions Of Life, Will Have A Better Chance Of Surviving, And Thus Be Naturally Selected. From The Strong Principle Of Inheritance, Any Selected Variety Will Tend To Propagate Its New And Modified Form.