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Helmont's experiment on a willow tree has been considered among the earliest quantitative studies on plant nutrition and growth and as a milestone in the history of biology. The experiment was only published posthumously in Ortus Medicinae (1648) and may have been inspired by similar experiments by Santorio, published in Ars de statica medicina ...
Jan Baptist van Helmont (1577–1644) performed a famous experiment, growing a willow tree in a pot of soil and supplying only rainwater for five years. The weight gained by the tree was greater than the weight loss of the soil. He concluded that the willow was made of water.
Jan Baptist van Helmont published what is considered the first quantitative experiment in plant physiology in 1648. He grew a willow tree for five years in a pot containing 200 pounds of oven-dry soil. The soil lost just two ounces of dry weight and van Helmont concluded that plants get all their weight from water, not soil.
Franciscus Mercurius van Helmont (baptised 20 October 1614 – December 1698 [3]) was a Flemish alchemist and writer, the son of Jan Baptist van Helmont. He is now best known for his publication in the 1640s of his father's pioneer works on chemistry , which link the origins of the science to the study of alchemy .
Boyle repeated the tree experiment of van Helmont, and was the first to use indicators which changed colors with acidity. He also performed numerous investigations with an air pump, and noted that the mercury fell as air was pumped out. He also observed that pumping the air out of a container would extinguish a flame and kill small animals ...
Van Helmont is a Dutch and Flemish surname. It may refer to: Jan van Helmont (1650 – between 1714 and 1734), a Flemish painter; Jan Baptist van Helmont (1580 - 1644), a Flemish chemist, physiologist, and physician; Franciscus Mercurius van Helmont (1614 - 1699) a Flemish alchemist and writer, the son of Jan Baptist van Helmont
Franciscus Sylvius (Dutch: [frɑnˈsɪskʏs ˈsɪlvijʏs], Ecclesiastical Latin: [franˈtʃiskus ˈsilvi.us]; born Franz de le Boë; [needs IPA] 15 March 1614 – 19 November 1672) was a Dutch physician and scientist (chemist, physiologist and anatomist) who was an early champion of Descartes', Van Helmont's and William Harvey's work and theories.
"Behavioral sink" is a term invented by ethologist John B. Calhoun to describe a collapse in behavior that can result from overpopulation.The term and concept derive from a series of over-population experiments Calhoun conducted on Norway rats between 1958 and 1962. [1]