. Elementary plant physiology. Plant physiology. 42 Elementary Plant Physiology. its rate of elongation by llie method described in § i, and note tlie manner in \\h\c\\ the cotyledons burst the integument. Measure the cotyledons into intervals of 5 mm. on a line drawn longitudinally, and on another drawn transversely, through the center. Note the regions of greatest growth and the total amount of enlargement (Figs. 21 and 22). Do all cotyledons behave in this manner ? 36. Germination of peas.—Soak some peas {Pisuni) in water for a day, then place in moist sawdust, and make daily, dissections.
. Elementary plant physiology. Plant physiology. 42 Elementary Plant Physiology. its rate of elongation by llie method described in § i, and note tlie manner in \\h\c\\ the cotyledons burst the integument. Measure the cotyledons into intervals of 5 mm. on a line drawn longitudinally, and on another drawn transversely, through the center. Note the regions of greatest growth and the total amount of enlargement (Figs. 21 and 22). Do all cotyledons behave in this manner ? 36. Germination of peas.—Soak some peas {Pisuni) in water for a day, then place in moist sawdust, and make daily, dissections. Note struc- ture of swollen seed. The hemispherical coty- ledons, filled with reserve material, are inserted on the short hypocotyl, at the lower end of which may be seen the rudi- mentary root. Follow the comparative growth of the root and shoot. Com- pare the origin of the root-hairs and secondary roots with those of the plants previ- ously examined. Compare the fate of the cotyledons with those of the Ricinus. Note the unequal growth of the young stem by which it is arched as it is pushed up through the soil. (See " Epinasty and hypo- ;) Mark off intervals on the stem, and ascertain the rate and region of growth (Figs. 21 and 22). The earlier leaves formed on the stem are seen to be simple. Fig. 22.—Advanced stages of germination of Ricinus (A) and Pisum (B). ?-, root system ; rfi, main root; rs, secondary roots; J>a, pa, root-hairs; ah-, hypocotyledonary axis; c, c, cotyledons; i, insertion of cotyledons; /, stem ; y, leaves. After Bonnier and Leclerc du 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 MacDougal, Daniel Trembly, 1865-1958. New York, London [etc. ] Longmans, Green, and Co.
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