She went on forgetting him with compound interest after that.

Something or somebody had superseded him as a source of interest.
'Good morning, Ma'am,' said the Major, meeting Miss Tox in Princess's Place, some weeks after the changes chronicled in the last chapter.
'Good morning, Sir,' said Miss Tox; very coldly.
'Joe Bagstock, Ma'am,' observed the Major, with his usual gallantry, 'has not had the happiness of bowing to you at your window, for a considerable period.

Joe has been hardly used, Ma'am.

His sun has been behind a cloud.' Miss Tox inclined her head; but very coldly indeed.
'Joe's luminary has been out of town, Ma'am, perhaps,' inquired the Major.
'I?
out of town?
oh no, I have not been out of town,' said Miss Tox.
'I have been much engaged lately.

My time is nearly all devoted to some very intimate friends.