“And yet,” he said, “this thirty-seventh degree of latitude is not a mere figure, and that it applies to the shipwreck or captivity of Harry Grant, is no mere guess or supposition. We read it with our own eyes.”

“All very true, your Honor,” replied Tom Austin, “and yet our search has been unsuccessful.”

“It is both a provoking and hopeless business,” replied Glenarvan.

“Provoking enough, certainly,” said the Major, “but not hopeless. It is precisely because we have an uncontestable figure, provided for us, that we should follow it up to the end.”

“What do you mean?” asked Glenarvan. “What more can we do?”

“A very logical and simple thing, my dear Edward. When we go on board the DUNCAN, turn her beak head to the east, and go right along the thirty-seventh parallel till we come back to our starting point if necessary.”

“Do you suppose that I have not thought of that, Mr. McNabbs?” replied Glenarvan. “Yes, a hundred times. But what chance is there of success? To leave the American continent, wouldn’t it be to go away from the very spot indicated by Harry Grant, from this very Patagonia so distinctly named in the document.”

“And would you recommence your search in the Pampas, when you have the certainty that the shipwreck of the BRITANNIA neither occurred on the coasts of the Pacific nor the Atlantic?”

Glenarvan was silent.

“And however small the chance of finding Harry Grant by following up the given parallel, ought we not to try?”