Jill looked at him thoughtfully.
"Well, we don't," she said.
"What do you do?" asked her sister. "This is a kind of altar, isn't it?"
"It is a kind of one," admitted Jill, "though Jacob did not call it an altar. He made a heap of stones and called it Bethel, and so we've done it too."
"Oh, I see," said Captain Willoughby. "This is Jacob's heap of stones. Isn't one of them in the King's coronation chair, by the bye?"
"But what use is this to you?" asked Mona, wanting to get to the bottom of it.
"It has to do with our vow," said Jill, speaking fast and earnestly. "We have done what Jacob did, we've told God we'll give Him our tenth. 'Of all that Thou shalt give me, I will surely give a tenth unto Thee.' That's the vow. And if anybody wants to make it I shall let them come here and make it, and they won't be trespassers any longer."
"That's a grand inducement," murmured the Captain, "but what does your tenth consist of, Jill? Sweets and currant-buns, and dolls, and picture-books? I should like the system explained."
"It's the tenth of our money, of course," said Jill, "I thought everybody knew that."