Freebase(0.00 / 0 votes)Rate this definition: Hydraulic conductivity. Hydraulic conductivity, symbolically represented as, is a property of vascular plants, soil or rock, that describes the ease with which a fluid can move through pore spaces or fractures.
Crispus Attucks was an African-American man killed during the Boston Massacre, making him the first casualty of the American Revolution.
On March 5, 1858, black abolitionists gathered at Fanueil Hall for a celebration of the first Crispus Attucks Day.. Thirty years later, a monument was erected on Boston Common in honor of Crispus Attucks, the first to defy, the first to die.. Sources. The Black Presence in the Era of the American Revolution 1770-1800, by Sidney Kaplan (New York Graphic Society, 1973). The Boston Massacre, by Hiller Zobel (W.W. Norton, 1970).