I left my room to go down to the ground floor of the house, and speak to the landlord about finding me a messenger. He happened to be ascending the stairs at the time, and we met on the landing. His son, a quick lad, was the messenger he proposed to me on hearing what I wanted. We had the boy upstairs, and I gave him his directions. He was to take the letter in a cab, to put it into Professor Pesca’s own hands, and to bring me back a line of acknowledgment from that gentleman⁠—returning in the cab, and keeping it at the door for my use. It was then nearly half-past ten. I calculated that the boy might be back in twenty minutes, and that I might drive to St. John’s Wood, on his return, in twenty minutes more.