Page:The Prose Works of Percy Bysshe Shelley (Volume 2).djvu/82

 to the Earth and the Earth to the Sun, is only a secular equation of a very long period, which has its maximum and minimum. The system of the Universe then is upheld solely by physical powers. The necessity of matter is the ruler of the world. It is vain philosophy which supposes more causes than are exactly adequate to explain the phenomena of things. Hypotheses non fingo: quicquid enim ex phœnomenis non deducitur, hypothesis vocanda est; et hypotheses vel metaphysicæ, vel physicæ, vel qualitatiem occultarem, seu mechanicæ, in philosophiá locum non habent.

You assert that the construction of the animal machine, the fitness of certain animals to certain situations, the connexion between the organs of perception and that which is perceived; the relation between every thing which exists, and that which tends to preserve it in its existence, imply design. It is manifest that if the eye could not see, nor the stomach digest, the human frame could not preserve its present mode of existence. It is equally certain, however, that the elements of its composition, if they did not exist in one form, must exist in another; and that the combinations which they would form, must so long as they endured, derive support for their peculiar mode of being from their fitness to the circumstances of their situation.

It by no means follows, that because a being exists, performing certain functions, he was fitted by another being to the performance of these functions. So rash a conclusion would conduct, as I have before shewn, to an