"For the life of me I cannot imagine how she came aboard, sir," he declared. "It was a great surprise to me to find her below. I was quite under the impression that she was twenty miles from Otherport."

"She is—and more," remarked Stockdale, with a laugh. "Very well, Fordyce; such devotion ought to be appreciated. Look after her, and keep her out of mischief: the mascot of submarine R19."

The interview ended, the Sub took his pet for'ard to be "adopted" by the ship's company. Evidently safe in the knowledge that her master could not now desert her, Flirt went willingly with half a dozen bluejackets to be fed, groomed, and to make the acquaintance of her new messmates.

"She seems to take to you, Cassidy," remarked the Sub, addressing a bull-necked able-seaman.

"Yes, sir," replied the man, saluting. "We've met afore, ain't us, doggie?"

"In what circumstances?" asked Fordyce.

"Well, sir," replied the man, "seein' an 'ow Cap'n Stockdale don't object, I'll make a clean breast of it. It was yesterday mornin', when we were drawin' stores in the dockyard, that I spots the dog sniffin' round the steps. Comes up to me friendly-like, as if she knowed I belonged to this 'ere craft. Then I looks at 'er collar and sees your name. 'Bless me, Smiler,' I says to my raggie, 'if this ain't Mr. Fordyce's dog, same as took a chunk outer that cove's leg t'other day.' 'Mr. Fordyce, he's aboard,' said Smiler. ''Ow about it? Let's give the dog a passage.' She nips into the boat and under the stern-sheets in a brace o' shakes. When we got alongside, out she 'ops and goes straight below, while you an' Mr. Macquare was spinnin' a yarn."

"Then why didn't you report to me?" asked Fordyce.

"Seein' as 'ow the dog didn't want to report 'erself, we thought as 'ow we'd let you have a little surprise, sir," explained Cassidy. "You see, she might a' been sent ashore."

Steadily R19 forged ahead, her course regularly checked by frequent observations on the sextant, and "picked out" on the chart. A deviation of a few miles would bring the submarine into the British mine-fields. Provided she kept to the trackless path, as announced by the Admiralty, she had nothing to fear from these; it was the sinister drifting mines sown by the Huns with a reckless disregard of the rights of neutrals and the vaunted "Freedom of the Seas" wherein lay the danger. In addition, it was always possible that a lurking U-boat might be within striking distance, for the old theory that "dog will not eat dog", i.e. one submarine is unable to attack another, had long since exploded. Overhead, too, a hostile seaplane, soaring at an immense height, might swoop down and attempt to destroy the craft by means of powerful bombs; and the danger, although remote in this part of the North Sea, could not be lost sight of.