The more Grenouille had become accustomed to purer air, the more sensitive he was to human odor, which suddenly, quite unexpectedly, would come floating by in the night, ghastly as the stench of manure, betraying the presence of some shepherd's hut or charcoal burner's cottage or thieves' den. And then he would flee farther, increasingly sensitive to the increasingly infrequent smell of humankind. Thus his nose led him to ever more remote regions of the country, ever farther from human beings, driving him on ever more insistently toward the magnetic pole of the greatest possible solitude.