In our own lifetime we are witnessing a startling alteration of climate. - Rachel Carson

For we all are united in a common cause. It is a proud cause, which we may serve secure in the knowledge that the earth will be better for our efforts. It is a cause that has no end: there is no point at which we shall say, "Our work is finished." We build on the achievements of those who have gone before us; let us, in turn, build strong foundations for those who will take up the work when we must lay it down.

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.

Measured against the vast backdrop of geologic time, the whole era of man seems but a moment-but how portentous a moment!