While we live we shall never get away from our thought; so then, we must consider that thought current, and reckon with it.

The motive power is turned on and we must grasp the helm if we sail the sea of life successfully, baffling storms and avoiding rocks.

Scientific books are usually dry, uninviting reading; they lack the human interest. They are generally bloodless skeletons.

We shall try to weave science into new patterns and paint interesting pictures so that science will attract and not repel.

This book is different in its suggestions, in its prescriptions, in its language, but it is universal with all scientific books, in that its aim is helpful truth.

We go by different routes, but our objective point is the same.

We will avoid technical names and symbols and speak the common language that the multitude understands.

We shall deal with problems and aspirations that come to us all in this busy workaday world.

We shall try to cut the underbrush in the swamp and blaze a plain trail out on to the big high road.

We shall keep in step to the drum-beats of truth, we will rest and recreate in cool shady places, and then up and on to our purpose with smiles on our faces, courage in our hearts, and song on our lips.