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Week-old shoots of 50 Sorghum entries representing 22 species, plus four Sorghum entries of undesignated species, were dried at 75° and the dried tissue extracted with water at room temperature. The resulting extracts were diluted in 0.1 M sodium hydroxide and spectra were scanned immediately to provide a measure of free p-hydroxybenzaldehyde. Scans were repeated after the basic solutions had stood for 3 hr at room temperature to permit hydrolysis of dhurrin (S-p-hydroxymandelonitrile β-D-glucopyranoside). Without exception, the quantity of free p-hydroxybenzaldehyde was very small in relation to the quantity released by dhurrin hydrolysis.