We shall not attempt the vain task of abridgment, a few words are all we can give to the subject. M. Comte confines himself to the main stream of human progress, looking only at the races and nations that led the van, and regarding as the successors of a people not their actual descendants, but those who took up the thread of progress after them. His object is to characterize truly, though generally, the successive states of society through which the advanced guard of our species has passed, and the filiation of these states on one another--how each grew out of the preceding and was the parent of the following state. A more detailed explanation, taking into account minute differences and more special and local phaenomena, M. Comte does not aim at, though he does not avoid it when it falls in his path. Here, as in all his other speculations, we meet occasional misjudgments, and his historical correctness in minor matters is now and then at fault; but we may well wonder that it is not oftener so, considering the vastness of the field, and a passage in one of his prefaces in which he says of himself that he _rapidly_ amassed the materials for his great enterprise (vi. 34). This expression in his mouth does not imply what it would in that of the majority of men, regard being had to his rare capacity of prolonged and concentrated mental labour: and it is wonderful that he so seldom gives cause to wish that his collection of materials had been less "rapid." But (as he himself remarks) in an inquiry of this sort the vulgarest facts are the most important. A movement common to all mankind--to all of them at least who do move--must depend on causes affecting them all; and these, from the scale on which they operate, cannot require abstruse research to bring them to light: they are not only seen, but best seen, in the most obvious, most universal, and most undisputed phaenomena. Accordingly M. Comte lays no claim to new views respecting the mere facts of history; he takes them as he finds them, builds almost exclusively on those concerning which there is no dispute, and only tries what positive results can be obtained by combining them. Among the vast mass of historical observations which he has grouped and co-ordinated, if we have found any errors they are in things which do not affect his main conclusions. The chain of causation by which he connects the spiritual and temporal life of each era with one another and with the entire series, will be found, we think, in all essentials, irrefragable. When local or temporary disturbing causes have to be taken into the account as modifying the general movement, criticism has more to say. But this will only become important when the attempt is made to write the history or delineate the character of some given society on M. Comte's principles.