Abstract
MR. C. W. FOLKARD raises a topic of general interest, which is perhaps worth brief discussion, as though the phenomena are well known they raise many problems which are still very obscure. He asks whether the sunlight upon the twigs stimulates the flow of sap; probably all that can safely be said in reply is that the sap flow is chiefly due to root activity and that the sunlight may well be effective by raising the temperature of the soil.
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PRIESTLEY, J. The “Bleeding” of Cut Trees in Spring. Nature 113, 492 (1924). https://doi.org/10.1038/113492b0
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DOI: https://doi.org/10.1038/113492b0
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