It Has Been A Bitter Mortification For

I Have Steadily Endeavored To Keep My Mind Free So As To Give Up Any Hypothesis, However Much Beloved (and I Cannot Resist Forming One On Every Subject), As Soon As The Facts Are Shown To Be Opposed To It.

Multiply, Vary, Let The Strongest Live And The Weakest Die.

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.

History Shows That The Human Mind, Fed By Constant Accessions Of Knowledge, Periodically Grows Too Large For Its Theoretical Coverings, And Bursts Them Asunder To Appear In New Habiliments, As The Feeding And Growing Grub, At Intervals, Casts Its Too Narrow Skin And Assumes Another.

The Main Conclusion Arrived At In This Work, Namely That Man Is Descended From Some Lowly-organised Form, Will, I Regret To Think, Be Highly Distasteful To Many Persons. But There Can Hardly Be A Doubt That We Are Descended From Barbarians.