Botany of the Southern states . in succulent plants of twoor more layers. The epidermis of the Oleander is composed ofthree or four layers of thick-sided cells. The joining lines ofthe cells may be seen on the leaves of plants by the microscope,presenting, generally, hexagonal figures more or less regular. Sometimes, however, thelines produce irregular figures, assignable tono geometrical form. The epidermis maybe easily separated from the subjacent layerof the leaves of the Iris or Lily, by means ofa sharp knife, and examined in water withthe microscope. If the microscope be good,the cellular
Botany of the Southern states . in succulent plants of twoor more layers. The epidermis of the Oleander is composed ofthree or four layers of thick-sided cells. The joining lines ofthe cells may be seen on the leaves of plants by the microscope,presenting, generally, hexagonal figures more or less regular. Sometimes, however, thelines produce irregular figures, assignable tono geometrical form. The epidermis maybe easily separated from the subjacent layerof the leaves of the Iris or Lily, by means ofa sharp knife, and examined in water withthe microscope. If the microscope be good,the cellular cavities will be easily seen, oth-erwise the flattened surface only can be dis-tinguished. 37. On the lines which separate the cells that compose thecuticle, small oval spaces are observed, which are called stomata, 85. What is the cuticle ? In what plants easily observed ? Of what Slants is it the only covering ?—36. Of what is the epidermis composed?Low may the epidermis bo obtained and examined ?—37. What are stomata ?. CUTICLE AND EPIDERMIS. 23 in allusion to the function they are supposed to perform—thatof mouths through which the plant respires, Fig. 21. Thesestomata are curiously constructed, generally consisting of twooblong cells, placed parallel to each other on opposite sides ofthe aperture, as seen in Fig. 21, and have the power of shuttingthe orifice, and at other times of opening it; thus the respirationand evaporation of the plant is controlled by these little these we shall speak more particularly when describing thefunctions of the leaves. Stomata occur on the green parts ofplants, and not usually on other parts, not even on blanchedportions of a plant. The number of stomata is very various on different plants,and even on the same plant, as on the upper and under sur-faces of leaves, being much the most numerous usually on theunder surface. On the leaf of the Misletoe, the number ofstomata on a square inch is only 200, the same number beingon ea
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Keywords: ., bookcentury1800, bookdecade1860, bookpublisher, booksubjectbotany
