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 machinery that turns this mill with such marvelous ease," Borromeo interrupted, assuming an undertaking which Don Geronimo willingly yielded to his forward tongue. "With your permission, Don Geronimo," he amended, seeing the corner of Magdalena's eye.

"Speak until you are empty, Borromeo," Don Geronimo granted.

"I am listening," Sergeant Olivera said.

"Then it was this way we accomplished it, against the belief of all men but Padre Ignacio," Borromeo began. He stretched his legs under the table, and leaned back at elegant ease, one arm hooked over the chair-post, one free to emphasize and illustrate his points. "In the beginning, Don Juan came to me to inquire if I had a furnace for melting iron. He was not surprised when I showed him the little melting-pot that I had made of clay, for running metal to cast many little things which save me long hammering at the anvil. He saw at once that I was a craftsman who knew metal from the very ore. That made it simple for him; half the work was already done.

"Then this Don Juan shapes a model of parts out of wood, his cog-wheels and his stems. We pack dry sand around them, and withdraw them with care, leaving the impression, the form. But when I pour in the metal, there is a disturbance, for the sand is not just so dry. So, this first casting is not good. Again, and again, many times we try,