 Near the end of his university career, Nietzsche completed Human, All-Too-Human (1878)—a book that marks a turning point in his philosophical style and that, while reinforcing his friendship with Rée, also ends his friendship with the anti-Semitic Wagner, who comes under attack in a thinly-disguised characterization of “the artist.” Despite the damage done by the unflattering review of The Birth of Tragedy, Nietzsche remained respected in his professorial position in Basel, but his deteriorating health, which led to migraine headaches, eyesight problems and vomiting, necessitated his resignation from the university in June, 1879, at age 34. At this point, he had been a university professor for ten years, and had just less than another ten years of productive intellectual life remaining.