At the age of thirty-two he re-entered Germany, and was soon after invited to take a professorship of physic, medicine, and surgery at the University of Basel, then illuminated by the presence of Erasmus and Oporinus. There, in his lectures, he professed “internal medicine,” denounced the antiquated systems of Galen and other authorities, and began his instruction by burning the works of these masters in a brass pan with sulphur and nitre. He created innumerable enemies by his arrogance and his innovations, but the value of his mineral medicines was proved by the cures which he performed. These cures only increased the hatred of his persecutors, and Paracelsus with characteristic defiance invited the faculty to a lecture, in which he promised to teach the greatest secret in medicine. He began by uncovering a dish which contained excrement. The doctors, indignant at the insult, departed precipitately, Paracelsus shouting after them:--“If you will not hear the mysteries of putrefactive fermentation, you are unworthy of the name of physicians.” Subsequently, he came into conflict with the municipal authorities, and was forced to flee from Basel. He resumed his strolling life, lodging at public inns, drinking to excess, but still performing admirable cures. Oporinus testifies that even during the period of his professorship he never seemed sober. In 1528, Paracelsus proceeded to Colmar. In 1530 he was staying at Nuremberg, where the faculty denounced him as an impostor, but he transfixed his opponents by curing in a few days some desperate cases of elephantiasis. “Testimonials to this effect,” says Hartmann, his latest biographer, “may still be found in the archives of the city of Nuremberg.” He continued his wanderings and his intemperate manner of life, dying on the 24th of September 1541. The actual manner of his death has been variously recounted. The original “Lives of Alchemysticall Philosophers” says that it occurred on a bench of the kitchen fire of the inn at Strasburg. Dr Hartmann, on the other hand, tells us that he “went to Maehren, Kaernthen, Krain, and Hongary, and finally landed in Salzburg, to which place he was invited by the Prince Palatine, Duke Ernst of Bavaria, who was a great lover of the secret arts. In that place, Paracelsus obtained at last the fruits of his long labours and of a wide-spread fame. But he was not destined to enjoy a long time the rest he so richly deserved.... He died, after a short sickness (at the age of forty-eight years and three days), in a small room of the ‘White Horse’ Inn, near the quay, and his body was buried in the graveyard of St Sebastian.” His death is supposed to have been hastened by a scuffle with assassins in the pay of the orthodox medical faculty.