Unity of plan everywhere lies hidden under the mask: of diversity of structure-the complex is everywhere evolved out of the simple.

Protoplasm, simple or nucleated, is the formal basis of all life. It is the clay of the potter: which, bake it and paint it as hewill, remains clay, separated by artifice, and not by nature from the commonest brick or sun-dried clod.

Make up your mind to act decidedly and take the consequences. No good is ever done in this world by hesitation.

The rung of a ladder was never meant to rest upon.

In matters of intellect, follow your reason as far as it will take you, without regard for any other consideration.

That man, I think, has had a liberal education, who has been so trained in youth that his body is the ready servant of his will.

It is given to few to add the store of knowledge, to strike new springs of thought, or to shape new forms of beauty. But so sure as it is that men live not by bread, but by ideas, so sure is it that the future of the world lies in the hands of those who are able to carry the interpretation of nature a step further than their predecessors.