went shouting with me up the hill. A whole char-à-banc-ful of people turned and stared at us in unison after the manner of people in chars-à-banc. It was one of those hot, clear days that Folkestone sees so much of, every colour incredibly bright and every outline hard. There was a breeze, of course, but not so much breeze as sufficed under these conditions to keep me cool and dry. I panted for mercy.
"I'm not walking fast, am I?" cried Gibberne, and slackened his pace to a quick march.
"You've been taking some of this stuff," I puffed.
"No," he said. "At the utmost a drop of water that stood in a beaker from which I had washed out the last traces of the stuff. I took some last night, you know. But that is ancient history now."
"And it goes twice?" I said, nearing his doorway in a grateful perspiration.
"It goes a thousand times, many thousand times!" cried Gibberne, with a dramatic gesture, flinging open his Early English carved oak gate.
"Phew!" said I, and followed him to the door.
"I don't know how many times it goes," he said, with his latch-key in his hand.
"It throws all sorts of light on nervous physiology, it kicks the theory of vision into a perfectly new shape!... Heaven knows how many thousand times. We'll try all that after—— The thing is to try the stuff now."
"Try the stuff?" I said, as we went along the passage.
"Rather," said Gibberne, turning on me in his study. "There it is in that little green phial there! Unless you happen to be afraid?"