The martyrdom of her brother the civil lieutenant lasted three months. 'He grew thin,' declares his physician, 'and emaciated; lost his appetite, often vomited, and had burning pains in the stomach.' He died on June 17, 1670. The councillor died in the following September. In this case, Dr. Bachot, the civil lieutenant's usual attendant, along with surgeons Duvaux and Dupré and the apothecary Gavart, declared after an autopsy that the deceased had been poisoned; but so little were the perpetrators of the crime suspected that La Chaussée drew a hundred crowns left him by his master as a reward for his faithful service. * * * * * We must follow the career of the marquise after the poisoning of her father and brothers, to understand to what depths her ill-regulated passion had thrown this woman, who belonged to the highest ranks of society by her name, her fortune, and the position of her family, and who was so charmingly endowed by Nature. She was at the mercy of a lackey, who held her honour and her life in his miserable hands. 'She used to receive him privately in her sitting-room, where she gave him money, saying, "He is a good fellow, and has done me great service"; and she caressed him.' Visitors coming upon her unawares found the marquise 'in great familiarity with La Chaussée,' and 'she made him hide behind her bed when the Sieur Cousté came to see her.' Sainte-Croix was a more formidable accomplice. What must have been the agony of this proud and passionate woman when she understood little by little that this man, to whom she had sacrificed everything, had seen in her only an instrument of his own pleasure and fortune, and now profited by his mastery of her secrets to squeeze money out of her by the most vulgar methods of intimidation! Sainte-Croix had locked up in a small box, which was to become famous, the letters, thirty-four in number, sent him by the marchioness, the two promissory notes signed by her after the murder of her father and brothers, and several bottles of poison. 'The said Lady Brinvilliers coaxed Sainte-Croix to give her his box, and wished him to give her her note for two or three thousand pistoles; otherwise she would have him poniarded.' The woman speaks out in this last phrase. At other times, desperate, frantic with terror, she thought of poisoning herself. She implored Sainte-Croix to give her the box, and when she received no answer, sent him this touching note: 'I have thought it best to put an end to my life, and I have therefore taken this evening what you gave me at so dear a price--the recipe of Glaser; by which you will see that I have willingly sacrificed my life to you; but I do not promise you, before I die, that I will not await you somewhere to bid you a last farewell.' In the last line she becomes herself again; there you have the menace of the offended woman.