1160. Hitherto we have regarded the plant as simply a planetary organism, namely, as a trunk with water-, earth-, and air-organ. But the primary vesicle does not lie wholly in the dark, but is illuminated upon its apex by the sun. Every operation, however, produces its like; thus in the plant a light-organ must also be developed. As the light evokes heat in the æther, so also does it evoke a heat-organ in the plant. As the heavenly bodies corevolve in æther by means of light and motion, or the gravitation condenses the æther into matter, so also must an organ of gravity originate also in the plant. These organs are not, however, predominant in the plant, because it is essentially planet or vegetable trunk. They can be therefore nothing else than the parts of the trunk itself with the properties of the æther or fire. They are thus a repetition of the trunk, wherein, in place of the material processes of growth, those of the light, heat, and gravity occur. The light-organ excites the heat-organ by polarization unto motion and thereby originates the organ of gravity. 1161. The process in which through polar tension the trunk has been reproduced, as the Whole in miniature, is called sexual process. The æther-organs are thus sexual organs. These sexual organs can only be a leaf-formation, because the last development of the stem is the leaf. The leaf-formations which, by means of polar tension, reproduce the trunk, are the _Flower_. The light-organ is the _corolla_. The heat-organ is the _pistil_. The organ of gravity the _seed_. The pollen upon the stigma sets the pistil in a state of tension with the trunk, whereby the sap, out of which the seed attains to perfection, ascends. Without this tension the pistil would not have had strength sufficient to perfect the seed. It would wither ere the latter had obtained sufficient nourishment. 1162. The development of the flower takes place through differentialization, individualization, or complete separation of the trunk-organs. The trunk indeed summons up all power in the leaves, to separate the three vegetable tissues and represent each as a particular organ; only in this formation it does not wholly succeed; for in a leaf the ribs or tracheal fascicles are still held together by cellular tissue. In the first place with the perfect separation of the tissues or, properly speaking, with the ex-organization of each of them unto an independent Whole, the limit of the vegetation is attained and the growth completed. This was the course of the whole of nature; in every system she has proceeded to individual consummation of the factors, to their liberation from chaos; and the developments of the systems were concluded, so soon as all factors became independent, or so soon as every factor had itself become an entire nature. Such was the case in the genesis of elements, and such in the metamorphosis of the earth-element into earths, salts, Inflammables, metals.