But what is this dreadful negation of the negation which makes life so bitter to Herr Duehring and which is to him what the unpardonable sin, the sin against the Holy Ghost, is to Christianity? It is a very simple process, and one, moreover, which fulfils itself every day, which any child can understand when it is deprived of mystery, under which the old idealistic philosophy found a refuge, and beneath which it will pay unprotected metaphysicians to take refuge from the stroke of Herr Duehring. Let us take a grain of barley. Millions of such grains of barley will be ground, cooked and brewed and then consumed. But let such a grain of barley fall on suitable soil under normal conditions; a complete individual change at once takes place in it under the influence of heat and moisture, it germinates. The grain, as such disappears, is negated, in its place arises the plant, the negation of the grain. But what is the normal course of life of this plant? It grows, blossoms, bears fruit and finally produces other grains of barley and as soon as these are ripe the stalk dies, and becomes negated in its turn. As the result of this negation of the negation, we have the original grains of barley again, not singly, however, but ten, twenty or thirty fold. Forms of grain change very slowly and so the grain of barley remains practically the same as a hundred years ago. But let us take a cultivated ornamental plant, like the dahlia or orchid. Let us consider the seed and the plants developed from it by the skill of the gardener, and we have in testimony of this negation of the negation, no longer the same seeds but qualitatively improved seed which produces more beautiful flowers, and every repetition of this process, every new negation of the negation, increases the tendency to perfection. Similarly this process is gone through by most insects, butterflies, for example. They come out of the egg by a negation of the egg, they go through certain transformations till they reach sex maturity, they copulate and are again negated, since they die as soon as the process of copulation is completed, and the female has laid her innumerable eggs. That the matter is not so plainly obvious in the case of other plants and animals, seeing that they produce seeds, plants, and animals not once but oftener, does not affect us in this case, we are now only concerned in showing that the negation of the negation actually does occur in both kingdoms of the organic world. Besides, all geology is a series of negated negations, one layer after another following the destruction of old and the establishment of new rock foundations. First, the original crust of the earth, through the cooling of the fluid mass, and through oceanic, meteorological, and chemical atmospheric action, being broken up into small parts, these broken masses form layers in the seas. Local elevations of the seas, through the ebb and flow of the waters, bring portions of these layers afresh