The Catholics tried in vain to prevent it, and it was actually held in January, 1523, on 67 theses drawn up by Zwingli.

Here, as so often, it was found that the battle was half won when the innovators were heard.
They themselves attributed this to the excellence of their cause; but, without disparaging that, it must be said that, as the psychology of advertising has shown, any thesis presented with sufficient force to catch the public ear, is {153} sure to win a certain number of adherents.

[Sidenote: October 27, 1523] The Town Council of Zurich ordered the abolition of images and of the mass.

The opposition of the cathedral chapter considerably delayed the realization of this program.
In December the Council was obliged to concede further discussion.

It was not until Wednesday, April 12, 1525, that mass was said for the last time in Zurich.