ABSTRACT
The perpetual irregular motion executed by small suspended particles due to random fluctuations was first observed in 1828 by the Scottish botanist Robert Brown, who described the motion of small pollen grains suspended in water. This kind of motion has since been called Brownian motion. Brown, however, did not know its cause. More pertinent for colloid science are confirming experiments by Perrin (Nobel Prize, 1926), who reported on the displacement of gutta perch a and mastic particles, the precursors of contemporary lattices [1].
