. Botany for secondary schools; a guide to the knowledge of the vegetation of the neighborhood. Plants. HOW TO STUDY LEAF HISTOLOGY 301 pared by making free-hand cross-sections of leaves held between two pieces of pith or cork, and mounting the material in water. Study such leaves as ivy (Hedera helix), begonia, cycas, geranium, and corn. Note the number of layers of palisade cells, the spongy parenchyma, the epidermal layers. Which cells bear chlorophyll? Write a brief description of the tissues of each leaf, and make a drawing of the geranium. To study stomates in cross-section: In the cross
. Botany for secondary schools; a guide to the knowledge of the vegetation of the neighborhood. Plants. HOW TO STUDY LEAF HISTOLOGY 301 pared by making free-hand cross-sections of leaves held between two pieces of pith or cork, and mounting the material in water. Study such leaves as ivy (Hedera helix), begonia, cycas, geranium, and corn. Note the number of layers of palisade cells, the spongy parenchyma, the epidermal layers. Which cells bear chlorophyll? Write a brief description of the tissues of each leaf, and make a drawing of the geranium. To study stomates in cross-section: In the cross-sections of leaves of geranium, corn, ivy, lily, or spider-lily prepared for the above exper- iment, look for the stomates and make a careful drawing from the one you can see best. Studrj of stomates in surface mew: From the under surface of leaves of geranium and impatiens, peel bits of epidermis by tearing the leaf. Mount these in water and examine under low power. Are the stomates scattered or in. 474. Leaf-scar of the plane-tree or sycamore. The scar surrounds the bud, which was covered by the hollow base of the petiole. groups? With the aid of a higher power, draw a few stomates show- ing their guard-cells and the sur- rounding epidermal cells. Make a similar study and sketch of the epidermis torn from the under surface of a Begonia sanguinea leaf. The openings or pores are known as stomata, singular stoma; also as stomates, singular stomate. Note on Scope, Apparatus, and Methods.—The work outlined in Part III is sufficient, if well done, to occupy one period of the pupil's time each school day for six weeks. These chapters are intended only as laboratory guides. The pupil should work out each structure or part for himself before taking up the succeeding subject. The work in this Part deals with only the elements of the subject, but it is as much as the pupil can hope to take up with profit in an outline course. Apparatus.—The apparatus necessary for the work outlined
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectplants, bookyear1913
