We won't take any chances, anyway.

Dave, you go to the telephone, and notify the police.

Your friends can stand guard over the box so that no one gets a chance to go near it." But, while Dave was at the 'phone, Mr.Drowan hung over the box as though fascinated.
"It takes fire to set this stuff off, doesn't it ?" he asked.
"No," Dick replied.

"If it's nitroglycerine in that box, a light, sharp blow might be enough to do the trick.

At least, that was about what Dr.Thornton said." Dave came back with word that the police would send some one at once.
"They asked me whom the stuff was addressed to," Dave continued, "and I had to admit that I didn't know." "It's addressed to Simon Tripps, to be called for.