. 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 Linnaean and a dichotomous analysis. Plants. CELLULAR TISSUE. 11 Fig. Pith of the Elder from pressure, they assumed their natural form, that of minute spheroidal bodies. This form of the cellular tissue composes the pith of all plants, all the succulent part of fruits, as of apples, melons, peaches, cucumbers, &c. The soft part of leaves and bark, and a large part of the stems of annual
. 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 Linnaean and a dichotomous analysis. Plants. CELLULAR TISSUE. 11 Fig. Pith of the Elder from pressure, they assumed their natural form, that of minute spheroidal bodies. This form of the cellular tissue composes the pith of all plants, all the succulent part of fruits, as of apples, melons, peaches, cucumbers, &c. The soft part of leaves and bark, and a large part of the stems of annual plants; and in general, ail the soft parts of the vegetable structure are com- posed of these minute simple vesicles, assuming generally more or less the hexagonal appearftnce when cut, as seen in Fig. 2, from the slight pres- sure to which they are subjected. 10. When the cells fit together by their plane faces like geometrical solids, forming the pulpy substances, as in the above cases, it is called parenchyma, but when the vessels are elongated and tapering, the ends lying over each other, they form pro- senchyma (Fig. 3), of which the hardest part of the bark is composed, and a part at least of the wood— perhaps all of it. 11. Cellular tissue assumes a great variety of forms, varying with the circumstances in which it is placed. In the stalks of some leaves the cells are in the form of cylinders (Fig. 4.) being forced only in one direction by rapid growth. In the medul- lary processes, they assume the form of regular, thin,-parallelopipedons. In some cases they are lobed, owing, undoubtedly, to unequal pressure in the early stage of their growth ; this frequently happens on woodv fibers the under side of leaves. mu^eTg" 12. The appearance of cells is very dif- ferent in different circumstances. They sometimes appear dotted, as though pierced with numerous pores. This is occasioned by Fig. Please note that these images are extracted from scanned page images that
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