We must now consider those who can excommunicate or be excommunicated. Under this head there are six points of inquiry:

(1) Whether every priest can excommunicate?

(2) Whether one who is not a priest can excommunicate?

(3) Whether one who is excommunicated or suspended, can excommunicate?

(4) Whether anyone can excommunicate himself, or an equal, or a superior?

(5) Whether a multitude can be excommunicated?

(6) Whether one who is already excommunicated can be excommunicated again?