Who is Memory?

Memory is Styver's clerk.

You are a little late, Memory,” said Stryver.
“About the usual time; it may be a quarter of an hour later.”
They went into a dingy room lined with books and littered with papers, where there was a blazing fire. A kettle steamed upon the hob, and in the midst of the wreck of papers a table shone, with plenty of wine upon it, and brandy, and rum, and sugar, and lemons.
“You have had your bottle, I perceive, Sydney.”