"But how can the wet oil burn?"
"You might as well ask—how can brandy burn?"
"But it might set the whole place on fire. When brandy begins to burn you can't put it out, even with water."
"How can the place be set on fire when the oil is shut up in a glass, and the fire as well?"
"In a glass? How can fire burn in a glass—won't it burst?"
"Won't what burst?"
"The glass."
"Burst! No, it never bursts. It might burst, I grant you, if you screwed the fire up too high, but you're not obliged to do that."
"Screw up the fire? Nay, dear, you're joking—how can you screw up fire?"
"Listen, now! When you turn the screw to the right, the wick mounts—the lamp, you know, has a wick, like any common candle, and a flame too—but if you turn the screw to the left, the flame gets smaller, and then, when you blow it, it goes out."
"It goes out! Of course! But I don't understand it a bit yet, however much you may explain—some sort of new-fangled gentlefolk arrangement, I suppose."
"You'll understand it right enough when I've bought one."
"How much does it cost?"
