. Elements of botany. Plants. 54 ELEMENTS OF BOTANY. Examine each thin section first with a power of about 25 diameters, then with a power of from 100 to 200 diameters. With the lower power, sketch a one-year-old section, labeling in your sketch : (a) The corky layer of the bark. (6) The green layer. (c) The masses of bast fibres. {d) The wood, with the medullary rays and vessels. (e) The Fig. 41. — Cross-Section of a Three-year-old Linden Twig. (Much magnified.) P, epidermis and corky layer of the bark ; Phi, bast; C, cambium layer ; JB, annual rings of wood. Alter examining this secti
. Elements of botany. Plants. 54 ELEMENTS OF BOTANY. Examine each thin section first with a power of about 25 diameters, then with a power of from 100 to 200 diameters. With the lower power, sketch a one-year-old section, labeling in your sketch : (a) The corky layer of the bark. (6) The green layer. (c) The masses of bast fibres. {d) The wood, with the medullary rays and vessels. (e) The Fig. 41. — Cross-Section of a Three-year-old Linden Twig. (Much magnified.) P, epidermis and corky layer of the bark ; Phi, bast; C, cambium layer ; JB, annual rings of wood. Alter examining this section with the higher power and noting par- ticularly the appearance of the wood-cells, replace it by a section of stem at least four years old. Sketch this as seen with the low power, then substitute the higher power and study the inner bark, noting especially the masses of very thick-walled hast-cells. What are the principal differences between the structure of the apple twig, so far as you have examined it, and the structure of a linden twig, as shown in Fig. 41 ?. 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; Bergen, Joseph Y. (Joseph Young), 1851-1917. Bergen's Botany: key and flora, Pacific coast ed. Boston : Ginn
Size: 1449px × 1725px
Photo credit: © Paul Fearn / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubjectplants, bookyear1896
