"This seems a queer thing," said Hardcastle, frowning a little, "to set up in the middle of an old abbey cloister."

"Now, don't tell me you're going to be silly," said Lady Mounteagle. "That's just what we meant; to link up the great religions of East and West; Buddha and Christ. Surely you must understand that all religions are really the same."

"If they are," said Father Brown mildly, "it seems rather unnecessary to go into the middle of Asia to get one."

"Lady Mounteagle means that they are different aspects or facets, as there are of this stone," began Hardcastle; and becoming interested in the new topic, laid the great ruby down on the stone sill or ledge under the Gothic arch. "But it does not follow that we can mix the aspects in one artistic style. You may mix Christianity and Islam, but you can't mix Gothic and Saracenic, let alone real Indian."

As he spoke, the Master of the Mountain seemed to come to life like a cataleptic, and moved gravely round another quarter segment of the circle, and took up his position outside their own row of arches, standing with his back to them and looking now towards the idol's back. It was obvious that he was moving by stages round the whole circle, like a hand round a clock; but pausing for prayer or contemplation.

"What is his religion?" asked Hardcastle, with a faint touch of impatience.

"He says," replied Lord Mounteagle, reverently, "that it is older than Brahminism and purer than Buddhism."

"Oh," said Hardcastle, and continued to stare through his single eyeglass, standing with both his hands in his pockets.

"They say," observed the nobleman in his gentle but didactic voice, "that the deity called the God of Gods is carved in a colossal form in the cavern of Mount Meru——"

Even his lordship's lecturing serenity was broken abruptly by the voice that came over his shoulder. It came out of the darkness of the museum they had just left, when they stepped out into the cloister. At the sound of it the two younger men looked first incredulous, then furious, and then almost collapsed into laughter.