Vein-islet numbers and veinlet termination numbers of leaves were found to be inversely proportional to the area of the lamina. The constants obtained by the multiplication of these values are termed the absolute numbers. This value is constant in those leaves where the differentiation of the veins has been completed. This is shown in the developing leaves of five Solanaceous Plants.
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Baibhav Kumar Gupta (1961) studied this question.