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The spectrum of the cyanide and fluoride complexes with peroxidase from horse radish was compared with corresponding spectra from living tissues. Quantitative determinations of the apparent volume concentration of peroxidase can be made from the bands in the green and red parts of the spectrum. Wheat roots contain nearly as much peroxidase as horse radish. The coincidence with bands of cytochromes is discussed. [ABSTRACT FROM AUTHOR]