ONE:Again, I think that Zeller quite misconceives the relation between Greek philosophy and Greek life when he attributes the intellectual decline of the post-Aristotelian period, in part at least, to the simultaneous ruin of public spirit and political independence. The degeneracy of poetry and art, of eloquence and history, may perhaps be accounted for in this way, but not the relaxation of philosophical activity. On the contrary, the disappearance of political interests was of all conditions the most favourable to speculation, as witness the Ionians, Democritus, and Aristotle. Had the independence and power of the great city-republics been prolonged much further, it is probable��as the example of the Sophists and Socrates seems to show��that philosophy would have becomexi still more absorbingly moral and practical than it actually became in the Stoic, Epicurean, and Sceptical schools. And theoretical studies did, in fact, receive a great impulse from the Macedonian conquest, a large fund of intellectual energy being diverted from public affairs to the pursuit of knowledge, only it took the direction of positive science rather than of general speculation.2 THREE:In reasoning up from the world to its first cause, we were given to understand that the two were related to one another as contradictory opposites. The multiple must proceed from the simple, and existence from that which does not exist. But the analogies of material production now suggest a somewhat different view. What every power calls into existence is an image of itself, but the effect is never more than a weakened and imperfect copy of its original. Thus the universe appears as a series of diminishing energies descending in a graduated scale from the highest to the lowest. Here, again, bad science makes bad philosophy. Effects are never inferior to their causes, but always exactly equal, the effect being nothing else than the cause in another place or under another form. This would be obvious enough, did not superficial observation habitually confound the real320 cause with the sum of its concomitants. What we are accustomed to think of as a single cause is, in truth, a whole bundle of causes, which do not always converge to a single point, and each of which, taken singly, is, of course, inferior to the whole sum taken together. Thus when we say that the sun heats the earth, this is only a conventional way of speaking. What really does the work is a relatively infinitesimal part of the solar heat separately transmitted to us through space. Once neglect this truth, and there is no reason why effects should not exceed as well as fall short of their causes in any assignable proportion. Such an illusion is, in fact, produced when different energies converge to a point. Here it is the consequent and not the antecedent which is confounded with the sum of its concomitants, as when an explosion is said to be the effect of a spark.

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