an automatic chemical analysis apparatus having a plurality of separate reagent containers placed inside of an annular array of reaction cuvettes . the reagent containers are arranged so as to be selectively accessible for dispensing a required reagent into a respective cuvette . at a predetermined position on the circular path of the cuvette array , a given sample is dispensed from a sample supply into a cuvette . during transporting of the cuvette containing a sample on a reaction path , a reagent from a selected of the reagent containers placed within the annular reaction cuvette array is dispensed by a suitable dispenser which can swing between the annular array of cuvettes and the reagent containers . after the reaction is completed , while the cuvette is advanced in the reaction line , the reactant containers are subjected to a photometric measurement at a measurement station located past the reagent dispensing position on the reaction line . then the cuvette is returned through a washing station to an original position of the annular reaction line for receiving a new sample .