SPENCER'S SOCIOLOGICAL DATA 249 makes him a purist in science, enables him to recall difficult exceptions, makes him distrustful of the summing-up phrases which cover a multitude of individualised occurrences. But just as the specialist is indispensable, so there can be no science without interpretation. We presume, however, that the historians agree with Spencer that their chief aim is to give an account, as rational as is possible for them, of the movement of human history, as Gibbon, for instance, did in his " Decline and Fall of the Roman Empire," but that they have a scientific instinct of recoil from generalising formulae, and probably doubt the validity of some of Spencer's. We presume that they admit that all events are not equally important, and that they are laws of perspective applicable to historical pictures, but that they doubt Spencer's competence—especially after that sentence of his regarding Greece and Rome—to act as judge of what is important or in proportion. Just as the descriptive naturalist justly resents any dictation from the biologist as to what is or is not worth observing, so the descriptive historian resents the sociologist's interference. And it is to be feared that men, both in history and in life, were too much mere "phenomena" to the Synthetic Philosopher, and that his Sociology was more biological than human. Spencer's Sociological Data.—Spencer may be accused of a lack of personal interest in the details of human history, of a lack of appreciation of what modern societies owe to the past, and of taking too mechanical a view of social evolution, but to accuse him of a priori methods is gratuitously unjust. Darwin in his othing is common or unclean,