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==Publications== * [[Jan Baptist van Helmont]]'s collected works, ''Ortus medicinae, vel opera et opuscula omnia'', are published posthumously by [[Lodewijk Elzevir]] in [[Amsterdam]], edited and [[Latin]]ized by his son [[Franciscus Mercurius van Helmont]]. Transitional between [[alchemy]] and [[chemistry]], they contain the results of numerous experiments and establish an early version of the [[law of conservation of mass]].<ref>{{cite web|title=Johann Baptista van Helmont|work=History of Gas Chemistry|publisher=Center for Microscale Gas Chemistry, Creighton University|date=2005-09-25|url=http://mattson.creighton.edu/History_Gas_Chemistry/vanHelmont.html|accessdate=2007-02-23}}</ref>
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