He waited but an instant, and then vaulted over on the other side. His curiosity had been aroused regarding the matter and he for the time being lost all interest in the chase at sea, as well as the appointed meeting under those trees on shore.
When he picked up the shell he was more surprised and mystified than ever.
"What does this mean?" he exclaimed aloud. "A round shell of the old-fashioned type instead of the conical ones used nowadays! Why, a shell like this has not been used in any navy for ages!"
He had been too excited at the moment of picking up the spluttering shell to note its shape or size, but now he saw at a glance that the one he held in his hand was obsolete and out of date. It was well enough for the old-fashioned smooth-bore guns, but those of modern make had no use for them.
As he puzzled over the mystery surrounding the projectile he suddenly heard a whistle from the other side of the embankment. He recognized it as the signal from the insurgent courier, and at once was alive to the importance of carrying out the instructions that had been given him.
He hastily dropped the shell upon the ground and sprang up and over the ridge of earth.
He gave an answering whistle and soon a form cautiously appeared from among some bushes not far away.
"Alto quien va?" called Clif before the newcomer had advanced a step.
This was the challenge, meaning, "Who goes there?"
The response came promptly: