may vary, nay, so far as we can judge they actually do vary; and any apparently slight variation of them, or even one of them, will result in different effects of great consequence. Without a detailed knowledge of all these special conditions, simply from a supposed _a priori_ knowledge of the world-substance, the idiosyncrasy of this or that particular solar system could not be _a priori_ determined. Here it will be such, and there, under perhaps slightly different circumstances, it will be entirely other. Here the centre of gravity may be in one great mass, there again it may be divided in two, so that the planets circle around two suns. From this point of view we have to call these results products of chance. To a being who not only might be supposed to know the intrinsic nature of existence, but could have present before his mind every event of the great interacting cosmos in its entire complexity, this kind of chance would, of course, also disappear. To him all states of things would appear throughout as _eindeutig bestimmt_. Yet, although in this way necessity permeates all events that take place, we do not intend to deny the irregularity of detail,[14] the specificalness of the particulars, the diversity of individual incidents and existences. According to our conception of nature they must remain, and we need not attribute them to absolute chance. To attribute irregularities to absolute chance (as Mr. Peirce does) is actually an abandonment of explaining them. The specificalness and particularity of nature can be said to be due to chance in so far only as they do not depend upon and are not determinable by the nature of the things under consideration, but result (with strict necessity of course) from the ever-changing conformations of surrounding circumstances. Thus the fate of a man depends mainly upon his character,—the proverb says, “Every man is the architect of his own fortune”—but not entirely. There are sometimes coincidences determining the fates of men, and through them the fates of whole nations. And these coincidences do not result from their character. Let everybody think of his own fate. Part of his life has been what it was because he is such a man as he is; and we can, within certain limits, predict the fate of a youth with whose character we are familiar. But how much of our lives depends upon circumstances which could be foreseen only by an omniscient being, and which, as we might properly say, if we do not misunderstand the term, is due to chance! FREE WILL. Compulsion is generally considered as a synonym of necessity. But the usage of the term necessity in the sense of compulsion is, in our opinion, very inappropriate, because misleading. Necessity and compulsion should not be confounded; for compulsion excludes free will and “necessity” does not.