. Botany of the southern states. In two parts. Part I. Structural and physiological botany and vegetable products. Part II. Descriptions of southern plants. Arranged on the natural system. Preceded by a Linnæan and a dichotomous analysis. Botany -- Southern States. CELLULAK TISSUE. 13 16. The cellular tissue is endowed ^vitll the power of repro- ducing itself. This is abundantly proved by the existence of vegetables consisting entirely of these cells; and the extnMue rapidity with which they are sometimes generated, is strikingly illustrated by an example given by Prof. Lindley, of a mush- roo
. Botany of the southern states. In two parts. Part I. Structural and physiological botany and vegetable products. Part II. Descriptions of southern plants. Arranged on the natural system. Preceded by a Linnæan and a dichotomous analysis. Botany -- Southern States. CELLULAK TISSUE. 13 16. The cellular tissue is endowed ^vitll the power of repro- ducing itself. This is abundantly proved by the existence of vegetables consisting entirely of these cells; and the extnMue rapidity with which they are sometimes generated, is strikingly illustrated by an example given by Prof. Lindley, of a mush- room, the ceils of w^hich he estimated to be produced at the rate of four billions per hour. Cells are formed either internally, and the parent cell disappears, or they are formed on the out- side ; and in either case the young cell supphes the conditions of forming new cells. 17. This tissue, at first soft and mucilaginous, becomes, by age, of a very different consistence, varying remarkably in its composition in different vegetables, and in different parts of the same vegetable. It always commences its existence, as -vve before remarked, possessed of the same organization, but in its maturity it may become the white, thin, transparent vesicle of the pith of the elder, or the hardened, thickened, unyielding prosenchyma of the wood and the liber. These changes are produced by several circumstances. In the elder all the sub- stance of the cell except the exterior vesicle becomes the food of the plant. The consistence of cellular tissue is most commonly increased by the deposition of a hard matter, sclerogen [aklcros^ hard, and gennaehi^ to produce), in concentric layers on the internal w\all of the cell. This is often deposited in such quan- tity as to fill the cell, when it becomes very hard and strong, a? in the grains of the Quince and Pear, Cocoanut-shell, the seed of the Ivory Palm, and Peach-stone. The deposition of the first layer is generally strictly followed in succeedin
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