Comparative Absorption of Cobalt-60 by Upper and Lower Epidermis of Leaves.

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Abstract
Of the 7 species, 5 absorbed as much cobalt-60 through the upper epidermis as through the lower epidermis, though the latter had many more stomata. Clivia miniata, with a thick cuticle on both surfaces and no stomata on the adaxial surface, absorbed equally by the 2 surfaces. In Phaseolus vulgar is var. Black Valentine and Glycine max var. Biloxi there was a significantly greater absorption through the lower surface, which had respectively 6 and 4 times as many stomata as the upper surface. It seems possible that there is some entrance through the stomata, but there is no doubt that there is penetration through the cuticle.

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