The allusion to the voice which called 'Dinah' must refer to something in Miss Mulock's letter.

Dinah was Miss Mulock's Christian name.
[14] In another letter, written about the same date to Mrs.Martin, Mrs.
Browning says: 'Perhaps you never heard of the crystal ball.

The original ball was bought by Lady Blessington from an "Egyptian magician," and resold at her sale.

She never could understand the use of it, but others have looked deeper, or with purer eyes, it is said; and now there is an optician in London who makes and sells these balls, and speaks of a "great demand," though they are expensive.

"Many persons," said Lord Stanhope, "use the balls, without the moral courage to confess it." No doubt they did..