150 THE EVOLUTION OF LIVING BEINGS 



,,families with which this world is peopled are all des- 

 ,,cended, each within its own class or group from com- 

 ,,mon parents, and have all been modified in the course 

 ,,of descent, that I should without hesitation adopt 

 ,,this view, even if it were unsupported by other facts 

 ,,or arguments." 



