Man has too long forgotten that the earth was given to him for usufruct alone, not for consumption, still less for profligate waste.

The equation of animal and vegetable life is too complicated a problem for human intelligence to solve, and we can never know how wide a circle of disturbance we produce in the harmonies of nature when we throw the smallest pebble into the ocean of organic life.

Sight is a faculty seeing is an art.

Wherever modern Science has exploded a superstitious fable or even a picturesque error, she has replaced it with a grander and even more poetical truth.

Man is everywhere a disturbing agent. Wherever he plants his foot, the harmonies of nature are turned to discords.

All Nature is linked together by invisible bonds and every organic creature, however low, however feeble, however dependent, is necessary to the well-being of some other among the myriad forms of life.