Abstract
The ratio of depth of palisade tissue to leaf thickness was nearly constant for each species or variety examined. Leaves of the lemon group show a value approximately 20% higher than that for leaves of the orange. The grapefruit ranks below the orange, and the Satsuma shows the lowest value. The close relationship which exists between the degree of palisade development for each species and its growth rate, especially in relation to propagation, is discussed.

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