It is, however, certain that in propounding this formula he had in view a further and, as often happened, a different meaning. This other meaning might be most simply illustrated by comparing it, as Vico himself did with Bacon and his "more certain method of philosophising": that method which Bacon expressed in the title of his work by the words _Cogitata et visa,_ and Vico proposed to "transfer from the natural to the human or political world." In a word, he demanded the construction of a typical history of human society (_cogitare_) which was then to be discovered in the facts (_videre_). Thus the ideal construction would acquire certainty from the facts, and the facts truth from the ideal construction: authority would be confirmed by reason and reason by authority. He demanded a science which should be at once a philosophy of man and a universal history of nations. Now this structure which he required--something intermediate between _cogitare_ and _videre,_ thought and experience, this mixture of the two processes--is intrinsically different from the unity of philosophy and philology, in so far as that is a philosophical interpretation of factual data. Such an interpretation is living history: the other is neither philosophy nor history, but an empirical science of man and society, drawing its materials from schemata which are neither the extra-temporal categories of philosophy nor the individual facts of history: although it can never be constructed without philosophical categories and historical facts. It is an empirical science; and as such, neither exact nor true, but only approximative and probable, and subject to verification and correction from the side both of philosophy and of history.