"'Pollard' ahoy!" came from the latter.

"Flagship ahoy!"

"William Henderson was an inmate of a naval hospital, where he had been sent to be watched on a suspicion of lunacy. A few days ago he escaped. We'll take him off your hands and see he is sent back where he belongs."

"Thank you, flagship."

The fleet patrol boat, which had been hovering near, a small cabin launch, now steamed in alongside the submarine. An ensign and four men came aboard. Captain Jack led them below, pointing out Henderson. The four sailors lifted him, carrying him up and over the side to their own boat.

"Now, follow us, captain," directed the ensign, "and we'll lead you to your anchorage."

Five minutes later the "Pollard" rode snugly at anchor, with all made trim and secure. But Captain Jack and his two boy friends, despite the lateness of the hour, were in no hurry to turn in below.

It was the first glimpse any of the trio had ever had of such an imposing war fleet, and all wanted to stay on deck drinking in the glory of the sight.

CHAPTER XX

"ONE ON" THE WATCH OFFICER