"Partly what you are going to do to-night—take tickets at the door; but that is not all. I have to carry about considerable apparatus and I need help about arranging it. Sometimes, also, I need help in my experiments. I had a young man with me; but he is taken down with a fever and obliged to go home. It is not likely, as his health is delicate, that he will care to resume his position. I must have somebody in his place. I have no doubt you will answer my purpose."
"How much pay do you give, sir?"
"A practical question," said the professor, smiling.
"To begin with, of course I pay traveling expenses, and I can offer you five dollars a week besides. Will that be satisfactory?"
"Yes, sir," said Harry, his heart giving a great throb of exultation as he realized that his new business would give him two dollars week more than his work in the shop, besides being a good deal more agreeable, since it would give him a chance to see a little of the world.
"Can you start with me to-morrow morning?"
"Yes, sir."
"Then it is settled. But it is time you were at the hall. I will give you a supply of small bills and, change, as you may have to change some bills."
He drew from his side pocket a wallet, which he placed in the hands of our hero.
"This wallet contains twenty dollars," he said: "Of course you will bring me back that amount, in addition to what you take at the door this evening."