Abstract
1. Plants of periwinkle and oleander were grown under two ranges of intensity of artificial light. The low intensity range was 86-300 foot-candles and the high intensity range was 301-965 foot-candles. Both the mesomorphic leaves of periwinkle and the xeromorphic leaves of oleander developed a significant degree of xeromorphy under high intensity, when judged on the basis of the relative increase in palisade thickness. 2. The xeromorphic leaves of oleander had significantly greater internal-external surface ratios than the mesomorphic leaves of periwinkle. The leaves of both species grown under high intensity had significantly larger internal-external surface ratios than the leaves of those grown under low intensity. 3. Transpiration rates of both species were measured by weighing in potometers. When all the plants were treated statistically as a group, correlations between the internal-external surface ratios and the transpiration rates were high and highly significant (r = +0.85 to +0.89). These correla...
Published Version
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