. Class-book of botany: being outlines of the structure, physiology and classification of plants; with a flora of the United States and Canada. Botany; Plants; Plants. 146 VEGETATION. 604 b *. 604, Minute portion of a leaf of Viola tricolor, viewed In perspective, showing, «, cells of epidermis above ; b, compact parenchyma of the upper portion of the leaf; c\ loose parenchyma; (/, epidermal-cells of tho lower surface with stomata, one cut and opening into tho intercellular passages. (Magnified 100 diameters.) 735. The structure of bracts sepals, petals, and other organs, which are but modifi
. Class-book of botany: being outlines of the structure, physiology and classification of plants; with a flora of the United States and Canada. Botany; Plants; Plants. 146 VEGETATION. 604 b *. 604, Minute portion of a leaf of Viola tricolor, viewed In perspective, showing, «, cells of epidermis above ; b, compact parenchyma of the upper portion of the leaf; c\ loose parenchyma; (/, epidermal-cells of tho lower surface with stomata, one cut and opening into tho intercellular passages. (Magnified 100 diameters.) 735. The structure of bracts sepals, petals, and other organs, which are but modifications of tho leaf, hardly requires a separ- ate notice. The same kinds of vessels pervade their parenchyma, but tho spiral exist in a larger proportion. Tn the pistil, the fibro- vascular bundles may be traced to the placenta, and thence into the funiculus and raphe of tho ovule. In tho more delicate or. gans chlorophyllc is wanting, and tho peculiar coloring, matter of whatever other tint, is uniformly diffused through the fluid con- tents of the cells of parenchyma. The depth of the tint depends on the number of cells thus colored. ^ â » Oâo * «fc- CHAPTER V, VEGETATION, OR THE PHYSIOLOGY OF PLANT LIFE. 736. Next inquiries. We have now briefly surveyed the mechan- ism of the plant, both its outward fofcms and internal structure. Wc next inquire into the uses of all this wonderful apparatus; what tho specific office which each part performs in the economy of the plant? and how do all parts cooperate in the work of living and growing? 737. This is a subject of great extent, and involves many inquiries of deep interest both in science and art,âmany inquiries, also, which have never been an- swered. Our limits confine us to the bare statement of admitted principles, to the exclusion of all speculative discussion. 738. What is life ? This inquiry meets us at the beginningâa problem never solved. The spontaneous action of the plant, the self- determined shapes which i
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