ed Jack.

"Don't you know?" demanded Captain Griswold. "Well, I'll tell you what.
You just put me in command here for fifteen minutes and I'll do the job
for you."

"All right, sir," said Jack. "Your commands shall be obeyed."

Captain Griswold turned to the nearest sailor.

"Take that hose and attach it to the nozzle on the tank," he directed.
The sailor did so.

"Now the pump," said the captain, "you will find a place for it on the
other side of the tank."

This was adjusted to the captain's satisfaction.

"Now," said the captain, "all you have to do is to stick this nozzle down
the conning tower, turn it so as to give the gas full play and pump. Of
course the gas would carry without the pump, but you save time this way."

"One moment, Captain," said Jack. "How about ourselves? Won't the gas
affect us as well as the Germans?"

Captain Griswold clapped a hand to his side.

"Now what do you think of that?" he demanded. "I must be getting old
before my time. Here, Lands," he called one of his own men, who
approached. "Go and tell Helgoson I want two dozen of those gas masks in
the store room; and hustle."

The sailor hurried away. He was back within fifteen minutes, and Captain
Griswold distributed the gas masks. Then he took the nozzle of the hose,
poked it down the conning tower and looked around.

"Everybody ready?" he asked.

Jack also glanced around. Every man on the deck of the submarine wore a
gas mask.

"All right, sir," said Jack.

"Then you turn that screw there when I give the word. All right? Then
shoot!"

There was a hissing sound as Jack turned on the gas.

For perhaps ten minutes Captain Griswold moved the hose to and fro. Then
he pulled it forth and motioned Jack to turn the screw again. This the lad
did. Captain Griswold then motioned the others to follow him, and led the
way below.

At the foot of the conning tower they stumbled across several figures,
overcome by the fumes. These were quickly bound and passed up on deck to
the men who remained behind.

The search of the submarine took perhaps half an hour. Every nook and
cranny was explored. The gas had done its work well. Apparently it had
poured in so rapidly that the crew had had no time to open the portholes,
for they were all closed. Captain Griswold opened them now.

Then he led the way on deck, and closing the conning tower, removed his
gas mask. The others followed his example.

"Simple, wasn't it?" said the captain