accept the invitation of the Elector of Saxony, coming thus endorsed by so many of their friends, and enter into this League. But once more the doctrine of the Lord’s Supper was an obstacle to union. The Elector went so far as to accept the Tetrapolitan creed on this point.1 So it was hoped by those who wished the Swiss cities to join the League, that Zwingli would let its eucharistic teaching pass without protest.2 But Zwingli was not so inclined, any more than Luther was.3 He said: “The business