What he wanted was a liquid glue to be put into little bottles and sold cheaply. "The kind of thing that sells itself," he said; "the kind of thing that pays its own small way as it goes along, until it has profits enough to begin advertising it right. Everybody has to use glue, and if I make mine convenient and cheap, everybody'll buy mine. But it's got to be glue that'll stick; it's got to be the best; and if we find how to make it we've got to keep it a big secret, of course, or anybody can steal it from us. There was a man here last month; he knew a formula he wanted to sell me, 'sight unseen'; but he was in such a hurry I got suspicious, and I found he'd managed to steal it, working for the big packers in their glue-works. We've got to find a better glue than that, anyhow. I'm going to set you and Campbell at it. You're a practical, wide-awake young feller, and Campbell's a mighty good chemist; I guess you two boys ought to make something happen."
His guess was shrewd enough. Working in a shed a little way outside the town, where their cheery employer visited them sometimes to study their malodorous stews, the two young men found what Lamb had set them to find. But Campbell was
