And I tell you what: we shall have to keep accounts.

I'll buy an account-book.

You're very good at arithmetic--you'll like keeping accounts," said the Terror suavely.
Since her mouth was full of luscious jam tart, Erebus did not feel that it would be delicate at that moment to protest.

Therefore on leaving the shop the Terror bought an account-book.

His distrust of literature prevented him from paying more than a penny for it.