In order that he might be able to prove the possibility of a Science of History, Mr. Buckle asked no more than the following concessions: 'That, when we perform an action, we perform it in consequence of some motive or motives; that those motives are the results of some antecedents, and that therefore, if we were acquainted with the whole of the antecedents and with all the laws of their movements, we could with unerring certainty predict the whole of their immediate results.' Now, there is certainly nothing in these demands which may not be unhesitatingly conceded. As there can be no effect without a cause, so there can be no action without a motive: the motive or motives of an action are the product of all the conditions and circumstances among which the agent is placed--which conditions and circumstances, again, must have been brought about by antecedent events. The same circumstances would indeed differently affect persons of different mental constitutions and characters; but the original constitution of a man's mind is itself the product of antecedent events, as is also any subsequent modification of character which it may have undergone. It cannot be denied, then, that men's motives are the results of antecedents. Equally undeniable is it that a knowledge of all the antecedents and of all the laws of their movements would enable us to foresee their results, for this, supposing the laws referred to to have any real existence, is merely equivalent to the self-evident proposition, that if we perceived certain causes and knew exactly how they would act, we should know beforehand what would be their effects. But what if there be no such laws? What if, on the showing of Mr. Buckle himself and of his associates, there neither are nor can be?