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First edition of Ortus medicinae, Helmont's most important work, and second edition of Opuscula medica, both published by the Amsterdam branch of the Elzevier Press. "The Birth of Medicine", edited posthumously by the author's son, is our chief source for the discoveries of Helmont with regard to the chemical nature of living processes. "In medicine, he introduced the examination of the specific gravity of urine for diagnostic purposes. He investigated the fluids in the human body and advanced the study of digestion and other physiological changes by discovering acid digestion in the stomach... Helmont's significance in the development of chemistry is perhaps even greater; he was the first to use the term 'gas' (derived from the Greek word 'chaos'). He realized that 'gas' was distinct from air and water vapour, and he distinguished the 'gases' derived from various sources, including that which we call carbon dioxide" (PMM). Immaculate copy.