In my future work this subject will be treated, as it well deserves, at greater length.

The elder De Candolle and Lyell have largely and philosophically shown that all organic beings are exposed to severe competition.

In regard to plants, no one has treated this subject with more spirit and ability than W.

Herbert, Dean of Manchester, evidently the result of his great horticultural knowledge.

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