Robert Brown was a 19th-century botanist who provided one of the earliest detailed descriptions of the cell nucleus. This and other discoveries were due to Brown's pioneering use of the microscope in his research.
Brown's other research included discovering cytoplasmic streaming, one of the mechanisms that delivers nutrients and genetic information to plant cells. He also performed research on plant fertilization and pollination, discovering the difference between gymnosperm and angiosperm seed plants. Brownian motion, the random motion of particles suspended in a liquid or gas, is also named after Brown, who was one of the first to discover this phenomenon through examining pollen under his microscope.