but, in these infinitely complicated members, vegetative nature admits much variety; in the plant from which these measures were taken the full complement appeared only at one of the secondary joints. The leaf of this plant has five ribs on each side, as its flower generally five masts, arranged with the most exquisite grace of curve; but of lateral proportion I shall rather take illustrations from architecture: the reader will find several in the accounts of the Duomo at Pisa and St. Mark's at Venice, in Chap. V. §§ XIV.-XVI. I give these arrangements merely as illustrations, not as precedents: all beautiful proportions are unique, they are not general formulæ. XXX. The other condition of architectural treatment which we proposed to notice was the abstraction of imitated form. But there is a peculiar difficulty in touching within these narrow limits on such a subject as this, because the abstraction of which we find examples in existing art, is partly involuntary; and it is a matter of much nicety to determine where it begins to be purposed. In the progress of national as well as of individual mind, the first attempts at imitation are always abstract and incomplete. Greater completion marks the progress of art, absolute completion usually its decline; whence absolute completion of imitative form is often supposed to be in itself wrong. But it is not wrong always, only dangerous. Let us endeavor briefly to ascertain wherein its danger consists, and wherein its dignity. XXXI. I have said that all art is abstract in its beginnings; that is to say, it expresses only a small number of the qualities of the thing represented. Curved and complex lines are represented by straight and simple ones; interior markings of forms are few, and much is symbolical and conventional. There is a resemblance between the work of a great nation, in this phase, and the work of childhood and ignorance, which, in the mind of a careless observer, might attach something like ridicule to it. The form of a tree on the Ninevite sculptures is much like that which, come twenty years ago, was familiar upon samplers; and the types of the face and figure in early Italian art are susceptible of easy caricature. On the signs which separate the infancy of magnificent manhood from every other, I do not pause to insist (they consist entirely in the choice of the symbol and of the features abstracted); but I pass to the next stage of art, a condition of strength in which the abstraction which was begun in incapability is continued in free will. This is the case, however, in pure sculpture and painting, as well as in architecture; and we have nothing to do but with that greater severity of manner which fits either to be associated with the more realist art. I believe it properly consists only in a due expression of their subordination, an expression varying according to their place and office. The question is first to be clearly determined whether the