You see, then, that Haeckel has a higher estimate of absolute nature than Noire who does not care to have anything to do with the nature of the absolute. But my object at this moment is to convince you that neither the one nor the other of these two, nor natural science, so-called, is directly digging in the tunnel which will give us light on the question of the limits of our understanding and the final cause of things. Our logic, on the other hand, which treats the intellect as a part of nature, cultivates a natural science that includes the mere empirical natural science in the same way in which the day of twenty-four hours includes the day of twelve hours and the night. Natural science proper deals mainly with tangible things. Light and sound, the objects of eye and ear, are still included in its studies. The objects of smell and taste stand on the dividing line. But the socalled sciences of the mind, such as grammar and politics, political economy and history, morals and law, and most decidedly logic, are entirely excluded. Such a limitation is well enough, if we remember that it is purely formal. However, it must not overlook the bridge which leads from limited nature to universal, infinite, nature. The monism of natural science has a far too narrow view of the universe. When it says that "all is motion," it says just as little or as much as Solomon with his "all is vain." Everything is crooked and straight, everything great and small, everything temporal and eternal, everything truth and life. But nothing is thus said to show the meaning of distinction in this world, to explain how rest exists in motion, and sense in nonsense. In order to differentiate logically we must know that everything is everything, that the universe or absolute is its own cause and the final cause of all things, which embraces all distinctions, even that of causality and that between matter and mind. NINETEENTH LETTER "Philosophy should not try to be edifying," said Hegel. This means that religious feeling is far below scientific thought. But there is a reverse side to this sentence, viz., that thoughts which do not rise to the edifying interconnection of all things, no matter whether they remain stuck in some specialty on account of frivolousness or of narrowmindedness, are far below a wise world philosophy. In a former letter I have already emphasized, and I hope to prove it more convincingly, that the conception of "God," or of the absolute, is indispensable for a logical world philosophy. You know that in my dictionary the gods and divinities of all religions and denominations are "idols," and justly so, since they are all manufactured images. Instead of the entire universe, they worship a more or less unessential part of it. The religions show by their idolatry, the sciences frequently by their little creditable indifference, that they have no conception of the intellect and its art of reasoning.