"Daddy!" cried Nita agonizedly. "Oh, daddy, try to fight it off just a little while! We've found a way to stop it! We can kill them all!"
"I have about ten minutes more, Nita," said her father gently. "You couldn't get to me. Be a good girl, Nita——" There was a crash. "There go the windows! Good-by, Nita, good-by——"
The others heard her cry out, and rushed from the music room to hear her calling, calling desperately for her father to answer her, calling into a silent phone.
CHAPTER IX.
Davis pounded mightily upon the great gate of the half-deserted shipyard. Behind him, Nita was sobbing in spite of her efforts to hold back her tears. Evelyn tried her best to calm Nita, but without real effect. Gerrod had shot the party out at the gate of the shipyard and darted off in the little motor car on some mysterious errand. Davis pounded again wrathfully, using a huge stone to make his blows reverberate through the yard. A workman came slowly toward them.
"Hurry! Hurry!" Nita called tearfully. "Please hurry!"
The workman recognized her through the palings. All of Morrison's employees knew his daughter. The workman broke into a run. The gate swung open.
"Where's Mr. Keeling, the manager?" demanded Nita urgently. "We must see him at once."
The workman pointed, and the three of them hurried as fast as they could walk toward the man he had indicated.
"Mr. Keeling," said Nita desperately. "Father is marooned in our house up the Hudson. He may be dead by now. We've got to get to him!"
"I don't know how——" began the manager helplessly.
"I want a submarine siren," said Davis crisply. "One that can be tuned to different notes. Also the fastest motor boat you have. Give the necessary orders at once."
"But the Silver Menace——" began the manager again.
"Don't stand there talking," barked Davis in a tone that secured instant obedience. "Get the siren and the boat. And hurry! This is life and death!"
Galvanized into action, but still confused, the manager gave the orders. A fast motor boat that had been hauled ashore and pot into a shed when the Silver Menace blocked the river was hauled out. A heavy submarine siren was hastily unearthed from one of the workshops, and Davis drove the workmen to the task of fitting a sling on the boat by which the siren could be lowered over the bow. A heavy crane was run up and the motor boat made fast, in readiness to be lifted overboard. Every one worked with the utmost speed of which they were capable. Davis was not his usual good-natured self now. He drove his workmen mercilessly. Hardly had the last of their preparations been completed when a heavy truck rumbled into the yard. Gerrod had commandeered the truck and worked wonders. A grand piano had been lifted bodily into the big automobile. As the truck stopped he was lifting the lid that protected the keys. An electrician stood by the siren, with the tuning apparatus exposed. Hardly had the engine of the truck been shut off when they were busy tuning the blast of the siren to match the tinkling sound of the piano. It took a heart-breakingly long time to get the pitches precisely alike, but then the launch swung high in the air and alighted on the surface of the jelly below. The electrician in the launch pressed the button that would set the siren at work sending out its blast of sound waves through the water.
Those on the bank watched in agonized apprehension. The siren sank into the jelly like mass. No audible sound issued from it, once it was submerged, but when the curious sound waves issued into the water from the giant metal plate that in normal times carried warnings to ships at sea a change was visible in the jelly. Where ever the curious water sound traveled the silvery jelly clouded and abruptly turned to liquid! Almost instantly the space between the two wharves, in which the launch lay, was free of the horrible stuff. Gerrod shouted excitedly. Davis swore happily. Nita pushed anxiously forward.
"We've got to get to daddy!" she cried desperately. "We mustn't waste a second! Not an instant!"
The four of them piled into the launch. An engineer leaped down and twisted the motor. The fast launch shot forward, the submarine siren at the bow sending out its strange water sound that was inaudible to those on board, but which had such an amazing effect on the microscopic animals that composed the silver sea. As the launch gathered speed and headed up the Hudson a high bow wave spread out on either side. The water on which they rode was yellowed and malodorous, but it was water, and not the silvery, slime that had threatened the world. The Silver Menace vanished before the launch as if by magic. When the motor boat approached, with its siren still sounding fiercely, though inaudibly, the jellied surface of the river shivered into yellowed liquid, and the creeping horror on the banks trembled and became a torrent of water that flowed eagerly back into the bed of the stream.
The island on which Morrison had been marooned loomed up ahead, looking like a small mountain of silver. The house at its top was as a monument of shining metal. But as the boat sped toward it the silvery appearance of the coating clouded and melted away. Instead a torrent of evil-smelling water poured down the sloping sides of the island and into the river again!
They found the servants weeping for joy. Morrison, when the windows of the library had broken in under the weight of the mass of the horror outside, had leaped through the door of the library and slammed the door behind him. They had calked the cracks with cloth, and for a moment isolated the Silver Menace in that one room. As window after window broke in, however, they had been forced to withdraw from room to room, until at last they were huddled together in a tiny linen closet, windowless and without ventilation. They were waiting there for death when they heard the rushing of water all about them and found the Silver Menace, silver and a menace no longer, flowing down to rejoin the waters from which it had come.
As is the way of women, Nita, having sobbed heartbrokenly for sorrow when she believed her father dead, now sobbed even more heartbrokenly for joy at finding him alive, but she did not neglect, after a reasonable interval, to bring Davis forward.
"You know him, daddy," she said, smiling. "Well, he is the person who found the way to destroy the Silver Menace, and so he's the person you are going to pay that big reward to."
Morrison shook hands with Davis. He knew what was coming next.
"And though it hasn't anything to do with the other things," Nita said proudly, "he's the person I'm going to marry."
"It would be ungracious," observed Morrison, "to disagree with you. Mr. Davis, you are a lucky man."
"I know it," said Davis, laughing in some embarrassment. He looked at Nita, who dimpled at him, and was promptly and frankly kissed for her daring. She did not seem to mind, however. In fact, she dimpled again.
The last vestige of the Silver Menace was turned to yellowed water within a month. Submarine sirens, carefully tuned to precisely the pitch that would cause the tiny shells to shatter themselves, were hastily set aboard huge numbers of fast steamers, that swept the ocean in patrols, clearing the sea as they went. Whenever the clear note was poured out by one of the under-water sirens the silvery animalcules died in their myriads. Slowly, as the evil smell of their bodies dissipated, the inhabitants of the Atlantic Ocean came back to their normal haunts. By shoals and schools, by swarms and in tribes, the fishes came down again from the North. A week after the destroying steamers began their patrol rain fell on the Atlantic coast. The abnormally dry air above the ocean took up water avidly and poured it down on the parched earth with a free hand. The ocean, too, took up again its former function of furnishing cool breezes during the day and warm breezes at night. The seashore became once more a place of charm and delight. At least Davis and Nita found it so. Davis was being waited upon with decorations and honorary degrees, with the freedom of cities and medals of honor from learned societies. At each presentation solemn speeches were made in which he was told how superlatively clever he was. Remembering the purely accidental nature of his discovery, he found it difficult to keep from laughing. These things were tiresome, but were not active nuisances until after his marriage. When he found that he and Nita would not be left alone, that no matter how scrupulously they concealed their identity it was sooner or later discovered and they were interviewed and written up in special articles for the newspapers he grew annoyed.