So, when he heard Eradicate's alarm, though he wondered what the old colored man was doing out of bed at that hour, Tom did not stop to reason out that puzzle. He acted quickly. His first care was to throw on the main switch, connected with a big storage battery, and to which were attached the wires of the lighting system. This at once illuminated every shop in the plant, and also the grounds themselves. Tom wanted to see what was going on. The use of a storage battery eliminated the running of the dynamo all night. And once he had done this, Tom began pulling on some clothes and a pair of shoes. At the same time he reached out with one hand and pressed a button that sounded an alarm in the sleeping quarters of Koku, the giant, and in the rooms of some of the older and most trusted men. All this while Eradicate was shouting away, down in the yard. "Massa Tom! Massa Tom!" he called. "Hurry! Hurry! Dey is killin' Koku!" "Killing Koku!" exclaimed Tom, as he finished his hasty dressing. "Then my giant must already be in the fracas. I wonder what it's all about, anyhow." "What's up, Tom?" came Ned's voice from the adjoining room. "I thought I heard a noise." "Your thoughts do you credit, Ned!" Tom answered. "If you listen right close, you'll hear several noises." "By Jove! You're right, old man!" Tom could hear his chum bound out of bed to the floor, and, at the same time, from the big shed where Tom was building his aerial warship came a series of yells and shouts. "That's Koku's voice!" Tom exclaimed, as he recognized the tones of the giant. "I'm coming, Tom!" Ned informed his chum. "Wait a minute." "No time to wait," Tom replied, buttoning his coat as he sped down the hall. "Oh, Tom, what is it?" asked Mrs. Baggert, the housekeeper, looking from her room. "I don't know. But don't let dad get excited, no matter what happens. Just put him off until I come back. I think it isn't anything serious." Mr. Damon, who roomed next to Ned, came out of his own apartment partially dressed. "Bless my suspenders!" he cried to Tom, those articles just then dangling over his hips. "What is it? What has happened? Bless my steam gauge, don't tell me it's a fire!" "I think it isn't that," Tom answered. "No alarm has rung. Koku seems to be in trouble." "Well, he's big enough to look after himself, that's one consolation," chuckled Mr. Damon. "I'll be right with you." By this time Ned had run out into the hall, and, together, he and Tom sped down the corridor. They could not hear the shouts of Eradicate so plainly now, as he was on the other side of the house. But when the two young men reached the front porch, they could hear the yells given with redoubled vigor. And, in the glare of the electric lights, Tom saw Eradicate leading along Boomerang, the old mule. "What is it, Rad? What is it?" demanded the young inventor breathlessly. "Trouble, Massa Tom! Dat's what it am! Trouble!" "I know that--but what kind?"