. Appleton's dictionary of machines, mechanics, engine-work, and engineering. ely congregated around the margin, and gradually moredistant towards the centre, until they finally disappear, and leave a central cavity, or a loose cellularstructure. Fig. 3932 represents the horizontal, and Fig. 3933 the vertical section of portions of thesame, or the cocoanut palm (Cocos nucifera) of half their full size. * In the Cissampelos Pnreira, belonging to the natural order Menispcrmacea:, this structure is singularly evident; themedullary rays are very thick, and almost detached from the intermediate wed
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. Appleton's dictionary of machines, mechanics, engine-work, and engineering. ely congregated around the margin, and gradually moredistant towards the centre, until they finally disappear, and leave a central cavity, or a loose cellularstructure. Fig. 3932 represents the horizontal, and Fig. 3933 the vertical section of portions of thesame, or the cocoanut palm (Cocos nucifera) of half their full size. * In the Cissampelos Pnreira, belonging to the natural order Menispcrmacea:, this structure is singularly evident; themedullary rays are very thick, and almost detached from the intermediate wedge-form plates, which are nearly solid, *XiC&Lthe fc, w I?ore9.by which they are pierced, much like the substance of the common cane. ~ . Lindleys Introduction to Botany, namely, ? Exogcns, and Endogens by the suine t The reader is referred to the following articles in the three editions of Dr. ]Exogenous atruciurs, and Of the stem and origin of wood; and also, .vithor, in the Penny Cyclopaedia; all are replete with physiological interest. WOODS, VARIETIES OF. 917 3932.. 3933. All the endogens are considered to commence from a circular pithy stem, which is entirely solid;some, as the canes, maintain this solidity, with the exception of the tubes or pores extending through-out their length. The bamboos extend greatly in diameter, so as to become hollow, excer>t the dia-phragms at the knots; these are often used as cases for rollsof papers. The palms generally enlarge still more consider-ably to their extreme size, which, in some cases, is fifty timesthe diameter of the original stem, the centre being soft andpithy. # Some of the palms, &c, denote each yearly increase by oneof the rings or markings upon their stems, which are alwayssoft in the upper part, like a green vegetable, and terminatein a cluster of broad pendent leaves, generally annual, andwhen they drop off they leave circular marks upon the stem, which are sometimes permanent, and indicate by their num-ber the age of t