similar nature through the sight of colour in its simplest purity of tint, an absolutely pure red or blue for example, not by any means a common occurrence, such pristine colours being often weakened through the addition to them of yellow or tints of each other[257]. Violet can no doubt appear to us as a pure colour, but only in an external object, not, that is to say, as a compounded colour[258], for it is not itself an elementary colour belonging to colour's essential differentiation. It is these elementary or cardinal colours, easily recognized by sense in their purity, which, on account of their crude opposition, are most difficult to unite together in harmony. Colours, on the contrary, which are blurred in their transparency by many other tints, although not so antagonistic to general harmony, fail to give us such direct enjoyment from the very fact that the energy of opposition in them is weakened. Green, for instance, is a compound of blue and yellow, but it is the neutralization of these cardinal colours, and for that reason less attractive to us in its own purity than blue and yellow in their secure[259] opposition. Such are the points of most importance we have to remark upon in dealing with the abstract unity of form no less than the simplicity and purity of the sensuous material. In whichever aspect we regard our subject-matter we have to review that which is by virtue of its abstract character destitute of life, and a unity with no true actuality. Ideal subjectivity is inseparable from this, and such is entirely absent from the beauty of Nature even at the highest potency of its manifestation. This essential defect points us imperatively forward to the Ideal, which Nature is unable to reveal to us, and in contrast with which the beauty of Nature appears as a subordinate mode. C. DEFECTIVE ASPECTS OF THE BEAUTY OF NATURE The true object of our inquiry is the beauty of art viewed as the only reality adequate to the Idea of beauty. We have hitherto treated the beauty of Nature as the first mode of the existence of the beautiful. We have now to inquire more closely into that which distinguishes natural beauty from that of art. As an abstract proposition we may affirm that the Ideal is beauty in its rounded completeness. Nature, on the contrary, brings before us beauty in its incompleteness. Such abstract predicates do not, however, help us much, for our real problem is rather to explain exactly what it is which makes the difference between the completeness of the one from the incompleteness of the other. Our inquiry therefore hinges on the question how it comes about that Nature is necessarily incomplete as a mode of beauty and how this incompleteness is asserted. When we have answered that we shall be in a better position to deduce both the necessity and essential significance of the Ideal.