The boys bent over and scanned with eyes shining with excitement the rude outline. There were wavy lines to indicate the water, and a blacker mass which was evidently intended for the island itself. On this were peaks rising to a considerable height, and the effect of the skyline was something like the teeth of a saw. There were figures on the map almost illegible, but by the aid of a magnifying glass which Phil took from a drawer they could make out what seemed to be the figures “14” and “81.”
“That’s probably the latitude and longitude,” exclaimed Dick, while Phil made a dive for an atlas.
“So I figured it,” replied Benton. “Probably the old boy made more or less of a guess at it, but in a rough way it’s likely to be correct. It isn’t probable that he had any instruments with him, but if what he says of the captain’s jealousy is correct it indicates that he was an important figure in the crew and probably had some knowledge of navigation. If he had had any ambition to supplant the captain, he’d have to know something about latitude and longitude.”
By this time Phil had found the page in the atlas referring to the West Indies, and was running his finger down it.
“Latitude 14, longitude 81,” he repeated. “Here it is in the Caribbean somewhere on a line between Jamaica and Honduras.”
“That’s correct,” assented Benton. “And there’s one very important point connected with that special location. You know that the Caribbean varies greatly in depth. In places it’s thousands of feet deep. In others there are hundreds of miles where the water is very shallow, where what seem to be great plateaus rise from the bed of the sea to within a hundred or two hundred feet of the surface. Now one of these shallow basins is that which lies between Jamaica and Honduras. Then too, the old pirate mentions in one part of this diary of his that when the vessel from which he was marooned was approaching the island, soundings were taken by the captain. That was because he knew he was in shallow waters and feared he might run aground.
“Now bear this fact in mind,” Benton adjured them impressively, “for on it hangs the whole story.”
CHAPTER VI
THE SUNKEN TREASURE
Phil put away the atlas and the boys redoubled their attention.
“It’s a thing to be noticed all through these papers,” Benton went on, “that the old pirate’s prayers for vengeance were on the souls of his enemies. That was because their bodies had passed beyond the reach of vengeance. For within a couple of hours after his comrades had marooned him, Santos had the satisfaction of seeing the pirate ship, the Sea Rover, as it was named, go down in a hurricane with all hands on board.