Flaubert is celebrated as a writer dedicated to research. But what we mean by “research” varies greatly from novelist to novelist. At the simple level of the popular novel there are diligent writers who find out everything they can about a subject—banking, say, or airports or the motor industry—and put this into their work, often in barely assimilable chunks, as proof that they know what they're talking about. More sophisticated novelists pile up research like a compost heap, but then leave it alone, let it sink down, acquire heat, and degrade usefully into fertilizing elements. Thus at the moment of note-taking a novelist may often have no idea how useful his scribble might prove.
A good example of this is found in Carnet 19, where Flaubert makes three successive notes concerning women of flexible virtue. The first is about Mlle X., former chambermaid of a young lorette (a lorette being a woman half-way between a grisette and a femme entretenue on the closely calibrated French sexual scale), who set up next door to her former mistress. Gentlemen leaving the lorette would routinely call on the ex-femme-de-chambre who, after performing her exercices de fellation, would enquire humbly, “Was that as good as Madame?” The second story is about an upwardly mobile bar girl in Algeria who celebrates her risen status by equipping herself with some “ancestors”; surrounded by secondhand pictures of fake relatives, she now plays salon hostess and receives officers she formerly pleasured for 10 francs a go. The third, and briefest note, is about a sixteen-year-old girl waiting in a boudoir to lose her virginity. She is served dinner, only eats the confitures, and then falls asleep on top of a pile of erotic engravings. Of the three, the first is a jolly story, complete in itself, but with something falsely neat about it— often the case in laddish anecdote; the second is a colourful social vignette; the third an unfinished moment (where is the man? did she lose her virginity? what happened to her afterwards?) which could be funny or sad or anything in between depending how it is told. The first two might be called “closed” stories, the third “open”; and it is a version of the third story (initially communicated to him by Suzanne Lagier) that Flaubert used in L'Education sentimentale.