Roger Bacon, the Franciscan monk, was persecuted on account of his studies in natural philosophy, and he was charged with, dealing in magic, because of his investigations in chemistry. His writings were condemned, and he was thrown into prison, where he lay for ten years, during the lives of four successive Popes. It is even averred that he died in prison. Ockham, the early English speculative philosopher, was excommunicated by the Pope, and died in exile at Munich, where he was protected by the friendship of the then Emperor of Germany. The Inquisition branded Vesalius as a heretic for revealing man to man, as it had before branded Bruno and Galileo for revealing the heavens to man. Vesalius had the boldness to study the structure of the human body by actual dissection, a practice until then almost entirely forbidden. He laid the foundations of a science, but he paid for it with his life. Condemned by the Inquisition, his penalty was commuted, by the intercession of the Spanish king, into a pilgrimage to the Holy Land; and when on his way back, while still in the prime of life, he died miserably at Zante, of fever and want--a martyr to his love of science. When the 'Novum Organon' appeared, a hue-and-cry was raised against it, because of its alleged tendency to produce "dangerous revolutions," to "subvert governments," and to "overturn the authority of religion;" [142] and one Dr. Henry Stubbe [14whose name would otherwise have been forgotten] wrote a book against the new philosophy, denouncing the whole tribe of experimentalists as "a Bacon-faced generation." Even the establishment of the Royal Society was opposed, on the ground that "experimental philosophy is subversive of the Christian faith." While the followers of Copernicus were persecuted as infidels, Kepler was branded with the stigma of heresy, "because," said he, "I take that side which seems to me to be consonant with the Word of God." Even the pure and simpleminded Newton, of whom Bishop Burnet said that he had the WHITEST SOUL he ever knew--who was a very infant in the purity of his mind--even Newton was accused of "dethroning the Deity" by his sublime discovery of the law of gravitation; and a similar charge was made against Franklin for explaining the nature of the thunderbolt. Spinoza was excommunicated by the Jews, to whom he belonged, because of his views of philosophy, which were supposed to be adverse to religion; and his life was afterwards attempted by an assassin for the same reason. Spinoza remained courageous and self-reliant to the last, dying in obscurity and poverty.