Abstract
Fundamental differences exist in the freezing point lowering and in the ash, calcium, and magnesium content of leaf sap of Eureka lemon as compared with Valencia and Washington Navel orange. The sap of normal mature lemon leaves is less active osmotically and contains less ash and calcium, but more magnesium, than the sap of orange leaves. The fact that the sap of the lemon leaf is more dilute than that of the orange leaf furnishes a partial explanation of the differences in degree of sensitiveness to low temperatures between lemon and orange trees.
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