Only within the moment of time represented by the present century has one species -- man -- acquired significant power to alter the nature of the world.

For the sense of smell, almost more than any other, has the power to recall memories and it's a pity we use it so little.

It is ironic to think that man might determine his own future by something so seemingly trivial as the choice of an insect spray.

When we go down to the low-tide line, we enter a world that is as old as the earth itself - the primeval meeting place of the elements of earth and water, a place of compromise and conflit and eternal change.

The years of early childhood are the time to prepare the soil.

It is a wholesome and necessary thing for us to turn again to the earth and in the contemplation of her beauties to know the sense of wonder and humility.

But man is a part of nature, and his war against nature is inevitably a war against himself.