The Monticellonian., 1915-10-14
THiRTlETH EPISODE
BEHIND THE WATER DOOR.

Del Mar made his way cautiously mouth of which he left the boat, after escaping from the little steamer
 Quite evidently he was worried by the failure to cut the great Atlantic cable, and he was eager to see wheth- CT any leak had occurred in the or genization which. as secret foreign agent, he had so carefully built up in America.
 As he skirted the shore of the river, he came to a falls. Here he moved even more cautiously than be- fore, looking about to make certain that no one had followed him.
 It was beautiful sheet of water that tumbled with a roar over the ledge of rock, then raced away swift ly to the sea in cloud of spray.
 Assured that he was alone, he ap- preached crevice in the rocks, near the falls. With another hasty look about. he reached in and pulled a lever.
 Instantly most marvellous change
 
 belief. The volume of water that came over the falls actually and rapidly de- creased until it almost stopped, drip ping slowly in a thin veil. There was the entrance of q cave-literally hid den behind the falls.
 Del Mar walked in. Inside was the entrance to another, inner cave, high i~ ba e+n that the waters had eroded. From the floor to this entrance led a ladder Del Mar climbed it, then stopped just inside the entrance to the inner cave For moment he paused. Then he pressed another lever. Almost imme- diately the thin trickle of water grew until at last the roaring falls complete ly covered the cave entrance. It was a clever concealnent. contrived by damming the river above and arrang- ing new outlet controlled by flood gates.
 There Del Mar stood, in the inner cave. A man sat at a table, a curious gear fastened over his head and cover ing his ears Before him was a huge apparatus from which fared a big bluish-green spark, snapping and cracking above the thunder of the waters. From the apparatus ran wires apparently up through cables that penetrated the rocky roof of the cavern and tho river above.
 It was Del Mars secret wireless station. close to the hidden submarine harbor which had been established be- meath the innocent rocks of the prom. ontory up the coast. Far overhead, on the cliff over the falls, were the antennae of the wireless.
 How is she working?" asked Del Mar.
 Pretty we'll" answered the man. ''No interference? 2" queried Del Mar, adjusting tho apparatus.
 The man shook his head in the nega- tive.
 We must get quenched spark ap- paratus," went CT Del Mar, pleased that nothing was wrong here. This rotary gap affair is cut of date By the way. want you to be ready to send a message, to be relayed across to cur people. I've got to consult the board below .n the harbor first. hcw- ever. I'll send a messenger to you. Very well. sir" returned the man, saiutipg as Del Mar went out.
 
 Out at Fort Dale, Lieutenant Wood ward was still entertaining his new friend. Professor Arnold. and had in- trcduced him to Colonel Swift, the commanding officer at the fort
 They were discussing the strange events of the early morning, when an orderly entered, saluted Colonel Swift and handed him a telegram. The colonel tore it open and read t. his face growing grave. Then he handed t to Woodward, who read:
 Washington. D. c.
 Radio station using illegal wave