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Summnary. Participation of phytochrome 'is evident in the nyctinastic responise of leaves of Albizzia julibrissin (silk-tree), Albizzia lophantha, Leucaena glauca, Poinciana gilliesi and Calliandra inequilatera; closure of excised pairs of pinnules upon darkening is rapid following red illumination and slow following far-red. Fondeville, Borthwick, and Hendricks (2) reported on a role of phytochrome in the nyctinastic response of the sensitive plant, Mimnosa pudica: closure of the pinnules upon darkening was rapid when the darkness 'followed a brief red illumination and slower if the darkness followed far-red, with appropriate reversibility. The major significance of this report led us to see wrhether such effects could be obhserved in plants other than the relatively anomalous Mimosa, our imniedFate objective being an experimental system more stable and quantitative than that orig.nally described. This objective has now been attained well enough to provide, among other things. a rapid and dependable elenentary laboratory exercise. Materials and MethodsAlbizzia julibrissin (silk-tree), A. loplianttha, Leucaena glauca, Pointciana gilliesi, and Calliandra inequilatera were propagated iin the \varm greenhouse from seeds and cuttings. These species all have

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