Light is the chaser away of darkness. Shade is the obstruction of light. Primary light is that which falls on objects and causes light and shade. And derived lights are those portions of a body which are illuminated by the primary light. A primary shadow is that side of a body on which the light cannot fall.

Study the science of art. Study the art of science. Develop your senses- especially learn how to see. Realize that everything connects to everything else.

If you cause your ship to stop and place the head of a long tube in the water and place the outer extremity to your ear, you will hear ships at a great distance from you.

Attention, if sudden and close, graduates into surprise; and this into astonishment; and this into stupefied amazement.

Did man, after his first inroad into South America, destroy, as has been suggested, the unwieldy Megatherium and the other Edentata?

The natural history of this archipelago is very remarkable; it seems to be a little world within itself.