Summary: The Second Vatican Council has recognised the validity of all the Sacraments of the Orthodox and Ancient Oriental Churches, and has authorised, on some conditions, a certain measure of ec­clesiastical intercommunion (communicatio in sacris) between Ca­tholics and the Orthodox or Ancient Oriental, wich extends to the Sacraments of Penance, the Eucharist, and the Anointing of the Sick. The author enquires about the possibility of such intercom­munion — on the same conditions and between the faithful of the same Churches — being extended also to the Sacraments of Baptism and Confirmation, as well as to the blessing of marriage. Latin ca­non law does not even mention these situations, but seems however not to forbid them; the drafts (« schemata ») of the projected Code of Oriental Canon Law are more sensitive to the problems, and accept some of these new possibilities.