Используйте «retentiveness» в предложении

1. He knew some anecdotes about the heroes of the turf, and various clever tricks of Marquesses and Viscounts which seemed to prove that blood asserted its pre-eminence even among blacklegs; but the minute retentiveness of his memory was chiefly shown about the horses he had himself bought and sold; the number of miles they would trot you in no time without turning a hair being, after the lapse of years, still a subject of passionate asseveration, in which he would assist the imagination of his hearers by solemnly swearing that they never saw anything like it