DAEWINISM, 
113 
We all know that however startling the effect may be, the 
causes of extinction are continually going on around us, and are 
common to all forms and all conditions of life ; and we know,, 
too, that while some forms become extinct, others flourish. 
These things are more and more impressed upon our minds 
every day, and though we cannot tell all the causes of the 
phenomena, it may surely be affirmed that the “ Origin of 
Species by Natural Selection ” is, if not the principal, at least 
one of considerable weight and importance. 
