The contents were known.

The signature of Adolphus Morsfield had a new meaning for her eyes, and dashed her at her husband in a spasm of revolt and wrath against the man exposing her to these letters, which a motion of her hand could turn to blood, and abstention from any sign maintained in a Satanic whisper, saying, "Here lies one way of solving the riddle." It was her husband who drove her to look that way.
The look was transient, and the wrath: she could not burn.

A small portion of contempt lodged in her mind to shadow husbands precipitating women on their armoury for a taste of vengeance.

Women can always be revenged--so speedily, so completely: they have but to dip.

Husbands driving wives to taste their power execrate the creature for her fall deep downward.