. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. No. 5.] PEA AND XASTURl'U'.\r SEEDS. 2I7 ¥•"'. FIG. 3. DESCRIPTION OF FIGURES. /../". = bast fibers. tr. = tracheid. ph. = phloem. jrj'. = xylem. (- = center of stem. FIG. i. — Part of a cross-section of the stem of a normal pea seedling. FIG. 2.—Part of a cross-section of the stem of a dwarf pea seedling. FIG. 3. —Cross-section of a sector of the stem of a normal nasturtium seedling. FIG. 4. — Part of a cross-section of the stem of a dwarf nasturtium seedling. I-'it,. 4. have been given and discussed were all draw
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. No. 5.] PEA AND XASTURl'U'.\r SEEDS. 2I7 ¥•"'. FIG. 3. DESCRIPTION OF FIGURES. /../". = bast fibers. tr. = tracheid. ph. = phloem. jrj'. = xylem. (- = center of stem. FIG. i. — Part of a cross-section of the stem of a normal pea seedling. FIG. 2.—Part of a cross-section of the stem of a dwarf pea seedling. FIG. 3. —Cross-section of a sector of the stem of a normal nasturtium seedling. FIG. 4. — Part of a cross-section of the stem of a dwarf nasturtium seedling. I-'it,. 4. have been given and discussed were all drawn from three plants of each species, nevertheless that the general results are trustworthy is shown by another set of observations made on different pea plants. These gave the following results : Ratio of diameters of dwarf and normal plants, 111:62 (.56); cells in a given sector (7°), 165 in normal and 106 in dwarf (.64); cells in strips from center to circumference proportional in width to the size of the cross-section, 219 and 144 respec- tively (.66). The number of cells in a definite area was 29 in the normal and 44 in the dwarf. These measurements con- firm those already discussed, for they show that the normal stem is larger in cross-section, is composed of a greater number of cells, and of larger cells than the dwarf. The next question to be examined is the degree of differen- tiation of the various plants. This differentiation may be studied in the fibre-vascular bundles, where we may note the. 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 Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole, Mass. :
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
