Jean Baptiste Van Helmont, born at Brussels in 1577, and died at Vilvorde near that city in 1644, was an erratic genius whose writings and experiments sometimes astonish us by their lucidity and insight, and again baffle us by their mysticism and puerility. Van Helmont was of aristocratic Flemish descent, and possessed some wealth. He was a voracious student and a brilliant lecturer. At the University of Louvain, however, where he spent several years, he refused to take any degree because he believed that such academic distinctions only ministered to pride. He resolved at the same time to devote his life to the service of the poor, and with this in view he made over his property to his sister, and set himself to study medicine. His gift of exposition was so great that the authorities of the University insisted on his acceptance of the chair of Surgery, though that was the branch of medical practice he knew least about, and though it was contrary to the statutes of the faculty to appoint a person as Professor not formally qualified. [Illustration: J. B. VAN HELMONT. 1577-1644. (From an engraving in the Bibliothèque Nationale, Paris.) ] For a time things went well, but Van Helmont got tired of medical teaching before the University became tired of him. The particular occasion which disgusted him with medical science was that he contracted the itch, and though he consulted many eminent physicians could not get cured of it. He came to the conclusion that the pretended art of healing was a fraud, and he consequently resolved to shake the dust of it from his feet, after he had recovered from the weakening effects of the purgatives which had been prescribed for his complaint. Then he set forth on his travels, and in the course of them he met with a quack who cured him of his itch by means of sulphur and mercury. After this he became a violent anti-Galenist. He studied the works of Paracelsus, and after some years came back to his native country full of ideas and phantasies. By marrying a wealthy woman Van Helmont became independent, and his scientific career now commenced. He erected and fitted a laboratory at Vilvorde, and devoted his time and skill to the study of chemistry, medicine, and philosophy. He described himself as “Medicus per Ignem,” and was one of the most earnest believers in the possibility of discovering the philosopher’s stone, and the elixir of life. Indeed he claimed that he had actually transmuted mercury into gold, and by his medical compounds it is alleged that he performed such miraculous cures that the Jesuits actually brought him before the Inquisition.