. Essentials of botany. Botany; Botany. ESSENTIALS OF BOTANY 3. Examination of the Bean. —Study the seed, both dry and after twelve hours' soaking, in the same general way in which the squash seed has just been examined.^ Notice the presence of a distinct plumule, consisting of a pair of rudimentary leaves between the cotyledons, just where they are joined to the top of the hypocotyl. In many seeds (as the pea) the plumule does not show distinct leaves. But in all cases the plumule contains the growing point, the tip of the stem from which all the upward growth of the plant is to proceed. Make
. Essentials of botany. Botany; Botany. ESSENTIALS OF BOTANY 3. Examination of the Bean. —Study the seed, both dry and after twelve hours' soaking, in the same general way in which the squash seed has just been examined.^ Notice the presence of a distinct plumule, consisting of a pair of rudimentary leaves between the cotyledons, just where they are joined to the top of the hypocotyl. In many seeds (as the pea) the plumule does not show distinct leaves. But in all cases the plumule contains the growing point, the tip of the stem from which all the upward growth of the plant is to proceed. Make a sketch of these leaves as they, lie in place on one of the cotyledons after the bean has been split open. Note the cavity in each cotyledon caused by the pressure of the plumule and of the hypocotyl.^ 4. Germination of the Grain of Corn. — Soak some grains of corn and plant them as directed in Sect. 1.^ Make six or more sketches at various stages to illustrate the growth of the plumule and the formation of roots; first a main root from the base of the embryo, then others more slender from the same region, and later on still others from points higher up on the stem. The student may be able to dis- cover what becomes of the large outer. Pig. 2. Young Seedling of Windsor Bean. , cotyledon; r, root; s, stem. 1 The larger the variety of bean chosen, the easier it will he to see and sketch the several parts. The large red kidney bean, the horticultural bean, or the Lima bean "will do well for this examination. ^ The teacher will find excellent sketches of most of the germinating seeds described in the present chapter in Newell's Outlines of Lessons in Botany, Part I. 3 The pupil may economize space by planting the new seeds in boxes from which part of the earlier planted seeds have been dug up for use in sketching, Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of
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