Abstract: Methods and apparatus for the simultaneous performance of a series of analyses upon a multiplicity of samples disposed in an upright array of cuvette receptacles therefor, said array being in mating facial juxtaposition with similarly disposed arrays of reagent dispensing means, sample dispensing means, treatment means, analytic means and receptacle cleaning means such that individual operative means are coordinately positioned for simultaneous engagement with a plurality of receptacles; and executing steps in the analytic sequence by moving the receptacle array to a series of spaced positions sequentially whereby individual receptacles are simultaneously progressed in a series of steps through a cycle of sample treatment and analysis to cleaning.