Lectures On the Elements of Botany Part I Containing the Descriptive Anatomy O
Lectures On the Elements of Botany Part I Containing the Descriptive Anatomy O
Anthony Todd Thomson
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evolved, before we can accord with his position; for it is during that period only that the pith is es- sential in trees and shrubs. But although its functions cease, yet the pith still remains a part of the trunk of the oldest trees, as long as these re- main sound. Some authors, among whom we find Willdenow *, Mr. Keithf, and Sir J. E. Smith +, assert that it disappears altogether, obliterated " by the increasing solidity of the wood. " Darwin $ supposes that it is either absorbed or imbued w...ith ligneous matter, so as not to be distinguishable from wood; an opinion which Mr. Knight com- bats, affirming that its place " is never filled with " wood || ;" while others contend that it never va- ries, being the same in the old trunk as in the young branch. Let us examine in what these opinions are correct. In stems, the wood of which is of a close texture, and the divergent layers very thin, no obliteration of the pith can take place, nor even any compression of it occur, after the case of wood which encloses it is perfected ; and, on close examination, it can readily be detected in the oldest sound stems of this description ; but, * Principles of Bot.
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