The "she" of this passage I take to be as purely imaginary an entity as Phlogiston; and it is not easy to see how a method of explanation which in physical science is found worse than barren can give any edification in the study of history. To say nothing of the familiar explanation that Caracalla's sole motive in conferring the citizenship on the provincials was the desire to lay on them corresponding taxes,[7] the proposition has no footing in political actualities. "Rome's self-abnegation that she might Romanise the world"[8] expresses no fact in Roman volition, thought, or deed; it is not the mention of a sentiment which swayed men's action, but the attempt to reduce a medley of actions to the semblance of a joint volition. There was no "Rome" capable of "self-abnegation" and susceptible of "reward." Why, then, should it be said? It is said either because the writer permits himself to fill in a perspective with a kind of pigment which he would not employ in his foreground, or because he is still too much under the sway of old methods when he is generalising conventional knowledge instead of analytically reaching new.[9] Either way the lapse is only too intelligible. And if an innovating expert, dealing with old facts, runs such risks, great must be those run by plain people when they seek to attain a generalised knowledge of facts which are the battle-ground of current ideals. Only by perpetual analysis can we hope partly to escape the snare of the pseudo-synthetic, the traps of rhetoric and exegetic fiction. § 3 The term "pseudo-synthesis" implies, of course, that there may be a true synthesis. What is necessary to such synthesis is that there shall have been a preliminary analysis; but a synthesis once justly made is the greatest of helps to new analyses. Now there is one such which may safely be brought to bear on the study of practical politics, because it is an axiom alike of inorganic physics and of biology, and a commonplace of human science, though seldom used as a means of historic generalisation. This is the simple principle that all energy divides ostensibly into forces of attraction and of repulsion.