If properly outlined and presented, there is probably no subject in the school curriculum that can be made of more service to a growing youth than can biology.
Biological problems confront him at every turn, and if he is a normal being, he will have asked himself question after question which an elementary knowledge of biology ought to help him to answer. Some of these questions may be the following:

In This Book, the judgment of the authors, plant biology should always be considered first and human biology last in the course for the following reasons: