"Remember," said he, "2 is _a_, and 3 is _b_, and so on. Be
careful until the guard changes."
He handed me a small watch as he was leaving.
"It may be good company," he remarked.
I unrolled the tissue as soon as I was alone. It was covered with
these figures:--
21-24-6-13-23-6
21-16-15-10-8-9-21 4-6-13-13 5-16-16-19
22-15-13-16-4-12-6-5 13-10-7-21 20-14-2-13-13
24-10-15-5-16-24 10-15 4-16-19-19-10-5-16-19 3-2-4-12
21-16 24-2-13-13 8-16 19-10-8-9-21 21-16 19-16-2-5
13-6-7-21 200 17-2-4-6-20 21-16 17-2-21-9 13-6-7-21
21-16 19-10-23-6-19 19-10-8-9-21 21-24-6-15-21-26
21-16 21-9-10-4-12-6-21.