No! thirteen, counting Tilbury.

It'll be too late to do it to-morrow." Arthur looked at Dig and Dig looked at Arthur.

Twenty-one sixpences were ten shillings and sixpence, and ten shillings and sixpence would buy a new bat,--at a cost of six stamps.

His father had warned him against gambling with money, but had said nothing about postage-stamps.
And the cautions Dig had received against all "evil ways" did not even specify gambling at all.
Simson took out his list and wrote Tilbury's name, and then waited for Arthur's decision.
"May as well," said Dig.
"Wait till to-morrow," said Arthur, who still felt qualms.
"You'll be too late then," said Simson.
"All right--that'll settle it then," said Arthur.
"Felgate said he thought you'd be sure to go in," urged the tempter.
"Did he ?" said Arthur, a good deal impressed.
"Yes," said Dig jocularly, already fumbling the ten-and-six in anticipation in his pocket.

"Any muff can get round Arthur." It was an unlucky jest, if the baronet's object was to decide his friend in favour of the proposal.