From the preface: "NIETZSCHE tells us that " woman is un-utterably more wicked than man." If Madame de Brinvilliers could be taken as a normal type of her sex one might be disposed to agree with the German philosopher. But Marie Marguerite d'Aubray was far from being an ordinary example of womanhood, and it is exactly that which makes her case so engrossing. Amongst the records of famous criminals the trial of this highly-born lady has always taken a prominent place. If criminology be at times a trifle morbid it is often valuable, and in this instance it enables us to follow rather closely a curiously complex society from which was evolved a mighty state. This volume is not intended to be so much a recital of the crimes of the Marquise as a picture of the lively circles in which she lived."