Abstract: A system which precisely arrays small objects into a plurality of containers which comprises a vessel containing the objects in a fluid suspension; a tube, the proximal end of which is positioned substantially at the bottom of the vessel and the distal end of which is connected to a member which directs gravitationally-formed fluid drops from the distal end downward into a container positioned below said distal end; a small-objects detector, for detecting the objects in the fluid in the tube, disposed near the distal end; a drop detector connected to the member below the distal end; a device for controlling flow of the suspension through the tube by pressurizing the vessel; or device for discriminating between those signals from the small-objects detector caused by the small objects and those signals caused by other events, i.e.