Physiological Botany

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Ivison, Blakeman, 1885 - Botany - 499 pages
 

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Page 395 - With these facts before us, there seems little difficulty in understanding how a radicle penetrates the ground. The apex is pointed, and is protected by the root-cap ; the terminal growing point is rigid, and increases in length with a force equal, as far as our observations can be trusted, to the pressure of at least a quarter of a pound, probably...

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