Robert Hooke

The eye is a most wonderful and curious instrument, and yet it is but a machine.

I have found that the force of a spring is proportional to its extension.

The more we search into the works of nature, the more we shall find cause to admire the wisdom and power of the Creator.

It is not by the force of argument, but by the force of experiment, that we must determine the truth of things.

The air is not a simple homogeneous body, but a mixture of several different sorts of particles.

The moon is not a smooth and polished body, but full of inequalities, like our earth.

The true method of inquiring into the nature of things is to begin with observation and experiment, and then to proceed to reasoning and demonstration.

I have observed in a piece of cork, a great many little boxes or cells, distinct from one another.

The earth is not a perfect sphere, but an oblate spheroid.

The motion of the planets is not uniform, but accelerated and retarded in different parts of their orbits.

It is a most difficult thing to make a true and exact observation, and much more difficult to make a true and exact judgment upon it.

The sea is not a level surface, but has its hills and valleys, like the land.

The light of the sun is not a simple homogeneous body, but a mixture of several different sorts of rays.

The more we examine the works of nature, the more we shall find them to be regular and orderly.

The air is not a vacuum, but a fluid body, capable of being compressed and expanded.

The true way of improving natural philosophy is to make more experiments, and to be less positive in our assertions.

The force of gravity is not a mere occult quality, but a real and sensible power.

The earth is not fixed and immovable, but has a diurnal and annual motion.

The more we know of nature, the more we shall admire the wisdom and power of God.

The true end of natural philosophy is not to make us believe, but to make us know.