1. A flow cytometry apparatus for the detection of biological particles of interest from a sample of unknown biological particles comprising: means for moving particles from a sample of biological particles of an unknown class, substantially one at a time, in a fluid flow stream; means for providing an incident beam of illumination directed at the particles in said flow stream; means for detecting light-related data associated with each moving particle as the particle passes through said beam of illumination; means for storing data representing a known class of particles having common characteristics based on light data collected from such known class of particles; means for applying such stored data to light data detected from sample particles of said unknown class in order to match patterns between the data of the known and unknown particles; and means for recognizing that particles from said unknown class belong to said known class as a result of matching patterns of respective light-related data.