She walked up and down in his study (the room where the noise from the street was least heard), and thought over every detail of their yesterday's quarrel.

Going back from the well-remembered, offensive words of the quarrel to what had been the ground of it, she arrived at last at its origin.

For a long while she could hardly believe that their dissension had arisen from a conversation so inoffensive, of so little moment to either.

But so it actually had been.