. Plant studies; an elementary botany. Botany. ; Al,(;.!•: 227 plex plants consist of veiT man)' crlls. It is necessary to know something of tlie ordinary living plant cell before the bodies of Alga? or any other plant bodies can be under- stood. Such a cell if free is approximately spherical in ontline (Fig. 204), but if pressed upon liy contiguous cells may be- come variously modified in form (Fig. 200). Bounding it tliere is a thin, elastic wall, composed of a sul)- stauce called crJhflnxe. The cell wall, therefore, foi'ms a delicate sac, which contains the liTing substance k
. Plant studies; an elementary botany. Botany. ; Al,(;.!•: 227 plex plants consist of veiT man)' crlls. It is necessary to know something of tlie ordinary living plant cell before the bodies of Alga? or any other plant bodies can be under- stood. Such a cell if free is approximately spherical in ontline (Fig. 204), but if pressed upon liy contiguous cells may be- come variously modified in form (Fig. 200). Bounding it tliere is a thin, elastic wall, composed of a sul)- stauce called crJhflnxe. The cell wall, therefore, foi'ms a delicate sac, which contains the liTing substance known as jirofoj)Ii/s/ii. This is the substance which manifests life, and is the only sitb- stanee in the plant which is alive. It is the proto- plasm which lias organized the cellulose wall about it- self, and which does all the plant work. It is a fluid sttbstance which varies much in its consistence, sometimes being a thin viscous fluid, like the white of an egg, some- times much more dense and compactly organized. The protoplasm of the cell is organized into various structures which are called ori/tiits of ihe cell, each organ having one or more special functions. One of the most con- spicuous organs of the living cell is the single ii)irleits,a com- pai-atively compact and ttsually spherical protoplasmic body, and generally centrally placed within the cell (Fig. 200). All about the nucleus, and filling up the general cavity within the cell wall, is an organized mass of much thinner protoplasm, known as ci/tiipJa^n/. The cytoplasm seems to form the general background or matrix of the cell, and the. OOO. Ci-II? from a moss leaf, showin2 micleiLS iiji in which tlitre is a nucle- ohis. cytoplasm iC). and chloroplasts (.1).— 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 Coulter, John Merle, 18
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectbotany, bookyear1900
