Helmont, Jean Baptist van, a celebrated German chemist, the father of chemistry, born at Brussels; his early years were divided between the study of medicine and the practice of a religious mysticism; the works of Paracelsus stimulated his interest in chemistry and physics, and having married a noble Brabant lady, he settled down on the family estate near Vilvorde, where he devoted himself to scientific research; mixed up a good deal of mysticism and alchemy with his scientific discoveries, and made a special study of gases; he was the first to prove the indestructibility of matter in chemical changes by utilising the balance in analysis; he invented the word gas, first used the melting-point of ice and the boiling-point of water as limits of a thermometric scale, and his physiological speculations led him to regard the stomach as the seat of the soul! (1577‒1644).
Definition taken from The Nuttall Encyclopædia, edited by the Reverend James Wood (1907)
Helmholtz, Hermann von * Heloïse