. Essentials of botany. Botany; Botany. 36 ESSENTIALS OF BOTANY former serving as channels for air and water, the latter (and w also) giving toughness to the root. Roots of shrubs and trees more than a year old will be p ^ found to have in- , ".-P ~7^ . ,, ^ , , ,. creased in thickness by the process described in Sect. 88, and a section may look quite un- like the young root- section shown in. ^ Fig. 19. Fig. 18. Lengthwise Section (somewhat dia- grammatic) through Root-Tip of Indian Corn. X about 130. to, root-cap; i, younger part of cap; z, dead cells separating from cap; «, growing poi
. Essentials of botany. Botany; Botany. 36 ESSENTIALS OF BOTANY former serving as channels for air and water, the latter (and w also) giving toughness to the root. Roots of shrubs and trees more than a year old will be p ^ found to have in- , ".-P ~7^ . ,, ^ , , ,. creased in thickness by the process described in Sect. 88, and a section may look quite un- like the young root- section shown in. ^ Fig. 19. Fig. 18. Lengthwise Section (somewhat dia- grammatic) through Root-Tip of Indian Corn. X about 130. to, root-cap; i, younger part of cap; z, dead cells separating from cap; «, growing point; o, epi- dermis ; p', intermediate layer between epidermis and central cylinder; p, central cylinder; rf, layer from which the root-cap originates. 46. Examination of the Root of a Shrub or Tree. — Cut thin trans- verse sections of large and small roots of any hardwood tree^ and examine them first with a low power of the microscope, as a two- inch objective, to get the general disposition of the parts, then with a hig'her power, as the half-inch or quarter- inch, for details. With the low power, note : (a) The brown layer of outer bark. (J) The paler layer within this. (c) The woody cylinder which forms the central portion of the root. 1 Young suckers of cherry, apple, etc., which may be pulled up by the roots, wUl afford excellent Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Bergen, Joseph Y. (Joseph Young), 1851-1917. Boston, Ginn
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