Few, if any, creatures are equally active all night.

The process of discovery is very simple. An unwearied and systematic application of known laws to nature, causes the unknown to reveal themselves. Almost any mode of observation will be successful at last, for what is most wanted is method.

It is one of the signs of the times. We confess that we have risen from reading this book with enlarged ideas, and grander conceptions of our duties in this world. It did expand us a little.

Whatever sentence will bear to be read twice, we may be sure was thought twice.

The book exists for us, perchance, which will explain our miracles and reveal new ones.

Cowards suffer, heroes enjoy.

Every oak tree started out as a couple of nuts who stood their ground.