ratiocination

This is joining two probabilities by way of Ratiocination or Deduction; the result of which is a less probability than either.

And, even when he sides with the opposite school, it does not mean that he trusts to any scientific process of ratiocination.

The former would be ranked, in our distribution, among fallacies of generalization, the latter among those of ratiocination.

At the same time I needn't say that in this affair that we're now in the middle of—there's no question of ratiocination.