"The first of these is the curvature of lines and surfaces, wherein it at first appears futile to insist upon any resemblance or suggestion of infinity, since there is certainly, in our ordinary contemplation of it, no sensation of the kind. But I have repeated again and again that the ideas of beauty are instinctive, and that it is only upon consideration, and even then in doubtful and disputable way, that they appear in their typical character; neither do I intend at all to insist upon the particular meaning which they appear to myself to bear, but merely on their actual and demonstrable agreeableness; so that in the present case, which I assert positively, and have no fear of being able to prove--that a curve of any kind is more beautiful than a right line--I leave it to the reader to accept or not, as he pleases, _that reason of its agreeableness which is the only one that I can at all trace: namely, that every curve divides itself infinitely by its changes of direction_."--(P. 63.) Our old friend Jacob Boehmen would have been delighted with this Theoria. But we must pass on to other types. Chapter vi. treats _of Unity, or the Type of the Divine Comprehensiveness_. "Of the appearances of Unity, or of Unity itself, there are several kinds, which it will be found hereafter convenient to consider separately. Thus there is the unity of different and separate things, subjected to one and the same influence, which may be called Subjectional Unity; and this is the unity of the clouds, as they are driven by the parallel winds, or as they are ordered by the electric currents; this is the unity of the sea waves; this, of the bending and undulation of the forest masses; and in creatures capable of Will it is the Unity of Will, or of Impulse. And there is Unity of Origin, which we may call Original Unity, which is of things arising from one spring or source, and speaking always of this their brotherhood; and this in matter is the unity of the branches of the trees, and of the petals and starry rays of flowers, and of the beams of light; and in spiritual creatures it is their filial relation to Him from whom they have their being. And there is Unity of Sequence," &c.-- down another half page. Very little to be got here, we think. Let us advance to the next chapter. This is entitled, _Of Repose, or the Type of Divine Permanence_. It will be admitted on all hands that nothing adds more frequently to the charms of the visible object than the associated feeling of repose. The hour of sunset is the hour of repose. Most beautiful things are enhanced by some reflected feeling of this kind. But surely one need not go farther than to human labour, and human restlessness, anxiety, and passion, to understand the charm of repose. Mr Ruskin carries us at once into the third heaven:--