"These vials," said the Doctor, "contain tiny pellets of the completed drug. That for diminishing size I have put in the red vials; those of blue are the other drug.
"I had rather a difficult time making them—that is, compared to what I anticipated. Most of the chemicals I bought without difficulty. But when I came to compound those two myself"—the Doctor smiled—"I used to think I was a fair chemist in my student days. But now—well, at least I got the results, but only because I have been working almost night and day for the past month. And I found myself with a remarkably complete experimental laboratory when I finished," he added. "That was yesterday; I spent nearly all last night destroying the apparatus, as soon as I found that the drugs had been properly made."
"They do work?" said the Very Young Man anxiously.
"They work," answered the Doctor. "I tried them both very carefully."
"On yourself?" said the Big Business Man.
"No, I didn't think that necessary. I used several insects."
"Let's try them now," suggested the Very Young Man eagerly.
"Not the big one," said the Banker. "Once was enough for that."
"All right," the Doctor laughed. "We'll try the other if you like."
The Big Business Man looked around the room. "There's a few flies around here if we can catch one," he suggested.