§ 19. But the form in a perfect tree is dependent on the revolution of this sectional profile, so as to produce a mushroom-shaped or cauliflower-shaped mass, of which I leave the reader to enjoy the perspective drawing by himself, adding, after he has completed it, the effect of the law of resilience to the extremities. Only, he must note this: that in real trees, as the branches rise from the ground, the open spaces underneath are partly filled by subsequent branchings, so that a real tree has not so much the shape of a mushroom, as of an apple, or, if elongated, a pear. § 20. And now you may just begin to understand a little of Turner's meaning in those odd pear-shaped trees of his, in the "Mercury and Argus," and other such compositions: which, however, before we can do completely, we must gather our evidence together, and see what general results will come of it respecting the hearts and fancies of trees, no less than their forms. FOOTNOTE: [1] This is Harding's favorite form of tree. You will find it much insisted on in his works on foliage. I intended to have given a figure to show the results of the pressure of the weight of all the leafage on a great lateral bough, in modifying its curves, the strength of timber being greatest where the leverage of the mass tells most. But I find nobody ever reads things which it takes any trouble to understand, so that it is of no use to write them. CHAPTER VIII. THE LEAF MONUMENTS. § 1. And now, having ascertained in its main points the system on which the leaf-workers build, let us see, finally, what results in aspect, and appeal to human mind, their building must present. In some sort it resembles that of the coral animal, differing, however, in two points. First, the animal which forms branched coral, builds, I believe, in calm water, and has few accidents of current, light, or heat to contend with. He builds in monotonous ramification, untormented, therefore unbeautiful. Secondly, each coral animal builds for himself, adding his cell to what has been before constructed, as a bee adds another cell to the comb. He obtains no essential connection with the root and foundation of the whole structure. That foundation is thickened clumsily, by a fused and encumbering aggregation, as a stalactite increases;--not by threads proceeding from the extremities to the root. § 2. The leaf, as we have seen, builds in both respects under opposite conditions. It leads a life of endurance, effort, and various success, issuing in various beauty; and it connects itself with the whole previous edifice by one sustaining thread, continuing its appointed piece of work all the way from top to root. Whence result three great conditions in branch aspect, for which I cannot find good names, but must use the imperfect ones of "Spring," "Caprice," "Fellowship."