Over increasingly large areas of the United States, spring now comes unheralded by the return of the birds, and the early mornings are strangely sile… - Rachel Carson

To have risked so much in our efforts to mold nature to our satisfaction and yet to have failed in achieving our goal would indeed by the final irony. Yet this, it seems, is our situation.

In nature nothing exists alone.

When one is concerned with the mysterious and wonderful functioning of the human body, cause and effect are seldom simple and easily demonstrated relationships. They may be widely separated both in space and time. To discover the agent of disease and death depends on a patient piecing together of many seemingly distinct and unrelated facts developed through a vast amount of research in widely separated fields.