de vérifier, * to ascertaîn

17. il est impossible qu'il ait. Hère the principal sentence expressing the likelihood of the action is tugative^ and hence is followed by a subjunctive. But il est possible^ being hypothetical, would also take a subjunctive after it, as the speaker does not vouch for the truth of the statement. See Eve §§ 239 (2) and Obs. , 341.

35. nul doute que... monseigneur ne lui fit gr&ce. This is another case of the subjunctive after a phrase denoting probability or the reverse. See note on 1. 17.