Every description of literature has its appropriate art. This truth is immediately acknowledged in works of imagination. We speak, in familiar phrase, of the Dramatic Art, or the Art of Poetry. But the presence of art is less generally recognised in works addressed to the reason. Nevertheless, art has its place in a treatise on political economy, or in a table of statistics. For in all subjects, however rigidly confined to abstract principles or positive facts, the principles and facts cannot be thrown together pell-mell; they require an artistic arrangement. Expression itself is an art. So that even works of pure science cannot dispense with art, because they cannot dispense with expression. What is called method in Science is the art by which Science makes itself intelligible. There is exquisite art in the arrangement of a problem in Euclid. If a man have a general knowledge of the fact that all lines drawn from the centre of a circle to the circumference are equal, but has never seen that fact proved by Euclid, let him attempt to prove it in his own way, and then compare his attempt with the problem in Euclid which demonstrates the fact, and he will at once acknowledge the master’s art of demonstration. Pascal is said to have divined, by the force of his own genius, so large a number of Euclid’s propositions, as to appear almost miraculous to his admirers, and wholly incredible to his aspersers. Yet that number did not exceed eighteen. In fact, art and science have their meeting-point in method.