The book Scientific Papers volume 4 was written by author George Howard Darwin Here you can read free online of Scientific Papers volume 4 book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Scientific Papers volume 4 a good or bad book?
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The ascending stem of the tree is a swift current, but over the mushroom the descending current is slow until close to the mushroom, when it is seen to be impelled by pulses. D. Iv. 22 338 EIPPLE-MARK IN SAND. [16, 2 I was on one occasion fortunate enough to observe a mote in the water which was floating nearly in the centre of a tree vortex, and counted twelve revolutions which it made before it was caught away from its fortunate position. If the adjoining crests are of unequal height the stem... of the tree is thrown over sideways away from the higher crest; and indeed it requires care to make the growth quite straight. The ink in the stem ascends with a series of pulses, and it is clear that there is a pumping action going on which renders the motion of each vortex somewhat intermittent, the two halves of the tree being pumped alternately. The amount of curvature in the stem of the tree depends on the amplitude of the oscillation of the water. Figs. 4, 5, 6, give fair repre- sentations of ink trees.
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