The Big Business Man joined them.
"We must destroy it absolutely," repeated the Doctor. "We can't just wipe it up."
"Some acid," suggested the Big Business Man.
"Suppose something else has got at it already," the Very Young Man said in a scared voice, and began hastily looking around the floor of the room.
"You're right," agreed the Doctor. "We mustn't take any chance; we must look thoroughly."
Joined by the Banker, the four men began carefully going over the room.
"You'd better watch that nothing gets at it," the Very Young Man thought suddenly to say. The Banker obediently sat down by the little pool of water on the floor.
"And I'll close the window," added the Very Young Man; "something might get out."
They searched the room thoroughly, carefully scanning its walls and ceiling, but could see nothing out of the ordinary.
"We'll never be quite sure," said the Doctor finally, "but I guess we're safe. It's the best we can do now, at any rate."