Robert Brown was a Scottish botanist and paleobotanist who made important contributions to botany largely through his pioneering use of the microscope. His contributions include one of the earliest de
Portrait by Henry William Pickersgill
Brown as a young man
Brown in 1855
Brownian motion
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Brownian motion is the random motion of particles suspended in a medium. The traditional mathematical formulation of Brownian motion is that of the Wiener process, which is often itself called "Browni
Robert Brown (botanist, born 1773)
…the microscope. His contributions include one of the earliest detailed descriptions of the cell nucleus and cytoplasmic streaming; the observation of Brownian motion; early work on plant pollination and fertilisation, including being the first to recognise the fundamental difference between gymnosperms and angiosperms…
Perrin examined the equilibrium (barometric distribution) of granules (0.6 microns) of gamboge, a viscous substance, under the microscope. The granules move against gravity to regions of lower concentration. The relative change in density observed in 10 microns of suspension is equivalent to that occurring in 6 km of air.
Brownian motion on a sphere