I sprinkle it on new powder for to surprise Master."
"Well, you've done it, all right," said Tom, grimly. "Have you any of the stuff left?"
"I put all in iron box where Master keep new powder."
"Well, then some of it must be there yet. Probably it sifted through the excelsior-like grains of my new explosive, and we'll find it on the bottom of the powder-case. But enough stuck to the strands to spoil my test. I'll just take a reading of the gauges, and then we'll make an investigation."
Tom, with Ned to help him, made notes of how far the weight had risen in the tube, and took data of other points in the experiment.
"Pshaw!" exclaimed Tom. "There wasn't much more force to my new powder, doped as it apparently has been, than to the stuff I can buy in the open market. But I'm glad I know what the trouble is, for I can remedy it. Come on back to the shop. Koku, don't you ever do anything like this again," and Tom spoke severely.
"No, Master," answered the giant, humbly.
"Did you ever see this man before, Koku?"
"No, Master."
"What kind of a fellow was he?" asked Ned.
"Oh, him got whiskers on him face, and stand
