The elements of botany / by Francis Darwin.

  • Darwin, Francis, Sir, 1848-1925.
Date:
1896
Catalogue details

Licence: Public Domain Mark

Credit: The elements of botany / by Francis Darwin. Source: Wellcome Collection.

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    ROOT. cu. in] ness or ii-ritability. This quality of growth which enables a root to grow straight down into the ground is of obvious use°to it, for it thus fixes itself most quickly and most effectively in the soil in which it has to play its part in the plant's economy. Before going on to the functions of the root it will be well to consider its structure. Fig. 13. Tbansvbbse section on? the Eoot of Vicia Faba (semi-diagrammatic), p.I, piliferous layer bearing root hairs, c, cortex, the cells of which are not shown. end, endodermis. p.e, pericycle' as, xylem phi, phloem 'p, pith ' central cylinder. Fig. 13 represents a transverse section of the primaiy root of a bean not far behind the tip, as seen with a low power of the microscope. In the centre of the section is a circular mass of cells differing in texture and aspect 3—2