Jan Baptist van Helmont (12 January 1580 – 30 December 1644) was a chemist, physiologist, and physician from the Spanish Netherlands. He worked during the years just after Paracelsus and the rise of iatrochemistry, and is sometimes considered to be "the founder of pneumatic chemistry". Van Helmont is remembered today largely for his ideas on spontaneous generation, his 5-year willow tree experiment, and his introduction of the word "gas" (from the Greek word chaos) into the vocabulary of science. From the book La ciencia y sus hombres : vidas de los sabios ilustres desde la antigüedad hasta el siglo XIX T. 2 [Science and its men: lives of the illustrious sages from antiquity to the 19th century Vol 2] By by Figuier, Louis, (1819-1894); Casabó y Pagés, Pelegrín, n. 1831 Published in Barcelona by D. Jaime Seix, editor , 1879 (Imprenta de Baseda y Giró)
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