nistering the poisons; and, in less than six weeks time, they had both gone to their long home.
Suspicion was now excited; but so cautiously had all been done, that it found no one upon whom to attach itself. The marquise had a sister, and she was entitled, by the death of her relatives, to half the property. Less than the whole would not satisfy Sainte Croix, and he determined that she should die the same death as her father and brothers. She was too distrustful, however; and, by quitting Paris, she escaped the destruction that was lurking for her.
The marquise had undertaken these murders to please her lover. She was now anxious to perpetrate another on her own account. She wished to marry Sainte Croix; but, though separated from her husband, she was not divorced. She thought it would be easier to poison him than to apply to the tribunals for a divorce, which might, perhaps, be refused. But Sainte Croix had no longer any love for his guilty instrument. Bad men do not admire others who are as bad as themselves. Though a villain himself, he had no desire to marry one, and was not at all anxious for the death of the marquis. He seemed, however, to enter into the plot, and supplied her with poison for her husband; but he took care to provide a remedy. La Brinvilliers poisoned him one day, and Sainte Croix gave him an antidote the next. In this manner he was buffeted about between them for some time, and finally escaped, with a ruined constitution and a broken heart.
But the day of retribution was at hand, and a terrible mischance brought the murders to light. The nature of the poisons compounded by Sainte Croix was so deadly, that, when working in his laboratory, he was obliged to wear a mask, to preserve himself from suffocation. One day, the mask slipped off, and the miserable wretch perished in his crimes. His corpse was found, on the following morning, in the obscure lodging where he had fitted up his laboratory. As he appeared to be without friends or relatives, the police took possession of his effects. Among other things, was found a small box, to which was affixed the following singular document:
"I humbly beg, that those into whose hands this box may fall, will do me the favour to deliver it into the hands only of the Marchioness de Brinvilliers, who resides in the Rue Neuve St. Paul, as every thing it contains concerns her, and belongs to her alone; and as, besides, there is nothing in it that can be of use to any person but her. In case she shall be dead before me, it is my wish that it be burned, with every thing it contains, without opening or altering any thing. In order that no one may plead ignorance, I swear by the God that I adore, and by all that is held most sacred, that I assert nothing but the truth: and if my intentions, just and reasonable as
