Let me begin by saying that I felt weird reading this section, much less writing about it here. I solely chose this passage because when I read it was creeped out while reading it!
“To enhance the mood, he first conjured up those that were earliest and most remote: the hostile, steaming vapors of Madame Gaillard’s bedroom; the bone-dry, leathery bouquet of her hands; the vinegary breath of Father Terrier; the hysterical, hot maternal sweat of Bussie the wet nurse; the carrion stench of the Cimetiere des Innocents; the homicidal odor of his mother. And he wallowed in disgust and loathing, and his hair stood on end at the delicious horror…
“And then all at once, the pent-up hate would erupt with orgasmic force-that was, after all, the point of the exercise. Like a thunderstorm he rolled across these odors that had dared offend his patrician nose. He thrashed at them as hail thrashes a grainfield; like a hurricane, he scattered the rabble and drowned them in a grand purifying deluge of distilled water. And how just was his anger. How great his revenge”
So, now that Grenouille is alone, and away from all humankind, I think that he will drive himself more mad than he already seemed. This passage was just so uncomfortable to read (so clearly I made you read it again). I think that it is a sort of turning point because we are seeing his intense connection to his smells in a way that angered him so much and this passage clearly eluded to him master bating literally to smell memories. This passage also marked a turn in the novel that may be more plot driven, now we have seen Grenouille and have understand his character so I think that the novel will be more plot driven than just laying a very extensive groundwork as it has been.