"Do you wish to start at once, sir?" he asked.
"In a few moments. What is the floor of the cave like where we are going?"
"Quite wet and slimy, sir."
"Very slippery?"
"Yes, sir."
"In that case before we go in we want to put on baseball shoes with cleats on them, so that we can run if we have to. Can you get us anything like that?"
"In a few moments, sir."
"Good! As soon as we can get them we'll start. In the meantime, may I look at that gun that was found?"
The Browning machine-gun was laid before the doctor. He looked it over critically and sniffed delicately at it. He took from his pocket a phial of liquid, moistened a portion of the water-jacket of the weapon, and then rubbed the moistened part briskly with his hand. He sniffed again. He looked disappointed, and again examined the gun closely.