it be obvious, on the one hand, that precisely the same causes must invariably produce the same results, it is equally evident, on the other, that the same results cannot be reproduced except by the same causes. If causes calculated to bring about certain phenomena undergo either augmentation or diminution, there must be a corresponding change in the phenomena. Now, effects cannot be identical with their causes, and, in the moral world, effects once produced become in turn causes, acting either independently or in conjunction with pre-existing causes. They become in turn the antecedents spoken of by Mr. Buckle, from which spring the motives of human conduct. But, as all such antecedents must necessarily differ from all former antecedents, they must also give rise to motives, must be followed by actions, and must bring about combinations of circumstances, differing from any previously experienced. Thus, in human affairs, there can be no recurrence either of antecedents or of consequences; and, as a scientific law is simply a record of the uniform recurrence of consequences, it follows that in human affairs there can be no scientific laws. It will be understood that human conduct, and the circumstances or causes which influence it, are here spoken of in the aggregate. It is not pretended that particular causes or circumstances may not continue permanently in operation, though with an influence modified by the concomitance of fresh circumstances; or that they may not continue to produce consequences differing from their former consequences not more than in proportion to the modification undergone by the causes. Still less is it pretended that certain human phenomena, with which human motives have little or nothing to do, may not be repeated once and again, notwithstanding the important changes constantly going on in every human society. It is not denied that marriages may continue for years together to bear much the same annual proportion to the population, provided that during those years there be no material change in the amount of the economical obstacles which commonly interfere, more than anything else, with men's natural inclination to marry. Still less is it denied that, in a given number of births, the number of girls may always preserve nearly the same superiority over that of boys, or that the proportion between red-haired and flaxen-haired children may generally be about the same, or that the percentage of letters misdirected in a given country may vary little during long periods. But, in the first of these cases, men do not get married, as Mr. Buckle imagined, irrespectively of their volition. If, for several years together, marriages continue to bear about the same proportion to population, it is because during that period circumstances continue to present a certain amount, and no more, of opposition to men's connubial proclivities. In the other cases, it is not at all because the parents