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Summary

An equation is proposed which has been successfully applied to the leaves or leaflets of fifteen species, relating the lengths of the main lateral nerves to their positions on the midrib. Certain constants arising from the equation are shown to be interrelated or correlated with the position of the leaf on the shoot.

The validity of the equation and the possibility of more general application among Dicotyledons is discussed. No explanation in terms of the growth processes of the leaf has been found.