If, as sometimes happens, in searching through a bog we come upon a bit of shaped wood, we do not say: this is a product of Nature, but, of Art. Its producing cause has conceived a purpose to which the bit of wood owes its form. Elsewhere too we should see art in everything which is made so that a representation of it in its cause must have preceded its actuality (as even in the case of the bees), though the effect could not have been thought by the cause. But if we call anything absolutely a work of art in order to distinguish it from a natural effect, we always understand by that a work of man.

(2). Art regarded as human skill differs from science (as can from know) as a practical faculty does from a theoretical, as Technic does from Theory (as mensuration from geometry).