From the nodes spring whorls of similar but more slender branches.
In the former he developed a valuable method for the investigation of aerial waves within pipes, based on the fact that a finely divided powder - lycopodium, for example - when dusted over the interior of a tube in which is established a vibrating column of air, tends to collect in heaps at the nodes, the distance between which can thus be ascertained.
All the metaxylems join at the nodes into a complete ring of xylem.
At the nodes the relation of the endodermis to the bundles undergoes rather complex but definite changes.
The same order of events may be ascertained to take place in the stem; but in this region it is complicated by the occurrence of nodes and internodes, growth in length being confined to the latter, many of which may be growing simultaneously.
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