His former fascinations, however, quickly returned, and again held him in suspension between love and vengeance. That the vehemence of his passion, however, might not want an object, he ordered Baptista to discover the retreat of the Cavalier de Vincini on whom he meant to revenge his lost honor. Shame forbade him to employ others in the search. This discovery suspended for a while the operations of the fatal scheme, which had before employed the thoughts of the marquis; but it had only suspended--not destroyed them. The late occurrence had annihilated his domestic happiness; but his pride now rose to rescue him from despair, and he centered all his future hopes upon ambition. In a moment of cool reflection, he considered that he had derived neither happiness or content from the pursuit of dissipated pleasures, to which he had hitherto sacrificed every opposing consideration. He resolved, therefore, to abandon the gay schemes of dissipation which had formerly allured him, and dedicate himself entirely to ambition, in the pursuits and delights of which he hoped to bury all his cares. He therefore became more earnest than ever for the marriage of Julia with the Duke de Luovo, through whose means he designed to involve himself in the interests of the state, and determined to recover her at whatever consequence. He resolved, without further delay, to appeal to the pope; but to do this with safety it was necessary that the marchioness should die; and he returned therefore to the consideration and execution of his diabolical purpose. He mingled a poisonous drug with the food he designed for her; and when night arrived, carried it to the cell. As he unlocked the door, his hand trembled; and when he presented the food, and looked consciously for the last time upon the marchioness, who received it with humble thankfulness, his heart almost relented. His countenance, over which was diffused the paleness of death, expressed the secret movements of his soul, and he gazed upon her with eyes of stiffened horror. Alarmed by his looks, she fell upon her knees to supplicate his pity. Her attitude recalled his bewildered senses; and endeavouring to assume a tranquil aspect, he bade her rise, and instantly quitted the cell, fearful of the instability of his purpose. His mind was not yet sufficiently hardened by guilt to repel the arrows of conscience, and his imagination responded to her power. As he passed through the long dreary passages from the prison, solemn and mysterious sounds seemed to speak in every murmur of the blast which crept along their windings, and he often started and looked back.