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In the absence, then, of any universal law of co-existence similar to the universal law of causation which regulates sequence, we are thrown back upon the unscientific induction of the ancients, per enumerationem simplicem, ubi non reperitur instantia contradictoria.

But though the course of nature is uniform, it is also infinitely various. Hence there is no certainty in the induction in use with the ancients, and all non-scientific men, and which Bacon attacked, viz. 'Inductio per enumerationem simplicem, ubi non reperitur instantia contradictoria' unless, as in a few cases, we must have known of the contradictory instances if existing.

The induction of the ancients has been well described by Bacon, under the name ofInductio per enumerationem simplicem, ubi non reperitur instantia contradictoria.” It consists in ascribing the character of general truths to all propositions which are true in every instance that we happen to know of.

The writer tells us how he dreamed that a dead relation of his came to his bedside, and announced that he must die that day. Unlike Miss Lee, he went on living. Yet the dream impressed him so much that he noted it down in writing as soon as he awoke. Dr. Johnson also mentions an instantia contradictoria.

Our only substitute for an universal law of coexistence is the ancients' induction per enumerationem simplicem ubi non reperitur instantia contradictoria, that is, the improbability that an exception, if any existed, could have hitherto remained unobserved. But the certainty thus arrived at can be only that of an empirical law, true within the limits of the observations.

The induction of the ancients has been well described by Bacon, under the name ofInductio per enumerationem simplicem, ubi non reperitur instantia contradictoria.” It consists in ascribing the character of general truths to all propositions which are true in every instance that we happen to know of.