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Plants of Bryophyllum tubiflorum were held 12 days, plants of Sempervivum tectorum 11 and 23 days without water. Then, the contents of sugars and starch were determined. In Bryophyllum the quantity of monosaccharides decreased, that of oligosaccharides and of starch increased. In Sempervivum the
Isocitric, citric, malic, and succinic acids are found in S. tectorum. Their contents, measured at various times during the year, show remarkable changes. Isocitric acid always dominates and reaches distinct maxima in December and June. During the winter and in the course of summer the quantity
The studies described in the paper were conducted with tissue slices of Crassulacean acid metabolism (CAM) plants floating in isotonic buffer. In a first series of experiments, temperature effects on the efflux of [(14)C]malate and(14)CO2 were studied. An increase of temperature increased the efflux