A Selection From the Physiological And Horticultural Papers Microform
A Selection From the Physiological And Horticultural Papers Microform
T a Thomas Andrew Knight
The book A Selection From the Physiological And Horticultural Papers Microform was written by author T a Thomas Andrew Knight Here you can read free online of A Selection From the Physiological And Horticultural Papers Microform book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is A Selection From the Physiological And Horticultural Papers Microform a good or bad book?
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I have in very few instances been able to make the walnut-tree repro- duce its bark from the alburnum, though under the same management I rarely failed to succeed with the sycamore and apple-tree. Pieces of the bark of the apple-tree will also live, and generate a small portion of alburnum, though only attached to the tree at their lower extremities ; probably owing to a small part of the true sap being carried upwards by capillary attraction, when the proper action of the cortical vessels is n...ecessarily suspended. The preceding experiments, and the authority of Duhamel, having per- fectly satisfied me, that both the alburnum and bark of trees are capable of generating a new bark, or at least of transmitting a fluid capable of generating a cellular substance, to which the bark in its more perfectly organised state owes its existence, my attention was directed to discover the sources from which this fluid is derived. Both the bark and the alburnum of trees are composed principally of two substances ; one of which consists of long tubes, and the other is cellular ; and the cellular substance of the bark is in contact with the similar substance in the alburnum, and through these I have long suspected the true sap to pass from the vessels of the bark to those of the alburnumf.
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