INTELLECTUAL AND PHYSICAL TRANSPLANTATION AS REMEDIES.—The different cultures are so many intellectual climates, every one of which is peculiarly harmful or beneficial to this or that organism. History as a whole, as the knowledge of different cultures, is the science of remedies, but not the science of the healing art itself. We still need a physician who can make use of these remedies, in order to send every one—temporarily or permanently—to the climate that just suits him. To live in the present, within the limits of a single culture, is insufficient as a universal remedy: too many highly useful kinds of men, who cannot breathe freely in this atmosphere, would perish. With the aid of history we must give them air and try to preserve them: even men of lower cultures have their value.—Add to this cure of intellects that humanity, on considerations of bodily health, must strive to discover by means of a medical geography what kinds of degeneration and disease are caused by each region of the earth, and conversely, what ingredients of health the earth affords: and then, gradually, nations, families, and individuals must be transplanted long and permanently enough for them to become masters of their inherited physical infirmities. The whole world will finally be a series of sanatoria. 189. REASON AND THE TREE OF MANKIND.—What you all fear in your senile short-sightedness, regarding the over-population of the world, gives the more hopeful a mighty task. Man is some day to become a tree overshadowing the whole earth, with millions upon millions of buds that shall all grow to fruits side by side, and the earth itself shall be prepared for the nourishment of this tree. That the shoot, tiny as yet, may increase in sap and strength; that the sap may flow in countless channels for the nutrition of the whole and the parts—from these and similar tasks we must derive our standard for measuring whether a man of to-day is useful or worthless. The task is unspeakably great and adventurous: let us all contribute our share to prevent the tree from rotting before its time! The historically trained mind will no doubt succeed in calling up the human activities of all the ages before its eyes, as the community of ants with its cunningly wrought mounds stands before our eyes. Superficially judged, mankind as a whole, like ant-kind, might admit of our speaking of “instinct.” On a closer examination we observe how whole nations, nay whole centuries, take pains to discover and test new means of benefiting the great mass of humanity, and thus finally the great common fruit-tree of the world. Whatever injury the individual nations or periods may suffer in this testing process, they have each become wise through this injury, and from them the tide of wisdom slowly pours over the principles of whole races and whole epochs. Ants too go astray and make blunders. Through the folly of its remedies, mankind may well go to rack and ruin before the proper time.