Whoever is led to believe that species are mutable will do good service by conscientiously expressing his conviction; for only thus can the load of prejudice by which this subject is overwhelmed be removed.

If numerous species, belonging to the same genera or families, have really started into life all at once, the fact would be fatal to the theory of descent with slow modification through natural selection.

Nothing is easier than to admit in words the truth of the universal struggle for life, or more difficult, at least I have found it so, than constantly to bear this conclusion in mind.

I see no good reasons why the views given in this volume should shock the religious views of anyone.

We are not here concerned with hopes or fears, only with truth as far as our reason permits us to discover it.

How odd it is that anyone should not see that all observation must be for or against some view if it is to be of any service!