"We must follow it, boys." He made his voice as reassuring as possible. "I believe there's a chance of putting it out of business. You men know that those Whateleys were wizards—well, this thing is a thing of wizardry, and must be put down by the same means. I've seen Wilbur Whateley's diary and read some of the strange old books he used to read, and I think I know the right kind of a spell to recite to make the thing fade away. Of course, one can't be sure, but we can always take a chance. It's invisible—I knew it would be—but there's a powder in this long-distance sprayer that might make it show up for a second. Later on we'll try it. It's a frightful thing to have alive, but it isn't as bad as what Wilbur would have let in if he'd lived longer. You'll never know what the world has escaped. Now we've only this one thing to fight, and it can't multiply. It can, though, do a lot of harm; so we mustn't hesitate to rid the community of it.