1, Apex of flowering shoot.
The short straight or curved process from the back of the pitcher behind the lid represents the organic apex of the leaf (A in fig.
At the apex of a root, covering and protecting th~ delicate tissue of the growing point, is a special root-cap consistinf of a number of layers of tissue whose cells break down into mucilagi towards the outer surface, thus facilitating the passage of the ape~ as it is pushed between the particles of soil.
This usually has the form of a tetrahedron, with its points base occupying the surface of the body of the axis and its apex pointing towards the interior.
21.Median Longitudinal Section through the Apex of the Root of Pteris cretica.
This clear separation between periblem and pleromi is mostly found in plants whose stem-apex forms a naked cone the leaves being produced relatively late, so that the stele of th young stem is obvious above the youngest leaf-traces (fig.
The periblem, one cell thick at the apex, produces the cortex, to which the piliferous layer belongs in Monocotyledons; and the plerome, which is nearly always sharply separated from the periblem, gives rise to the vascular cylinder.
The tissueo are completely formed much nearer to the apex, than is the case in the stem.
Just behind its apex the cells are found to be all in process of active division.
They then gradually lose the power of growth, the oldest ones or those facthest from the apex parting with it first, and they pass gradually over into the condition of the permanent tissues.
The growing apex of such a stem will alternately incline, first to one side and then to the other, exhibiting a kind of nodding movement in the two directions.
The relation of the nucleolus to the chromosomes is clearly seen in the reconstruction of the daughter nuclei after division in the cells of the root-apex of Phaseolus (fig.
It is thought to have had its apex in Italy—in Venice, Florence, and Rome.
There are also already within the ice narrow oblong perpendicular bubbles about half an inch long, sharp cones with the apex upward; or oftener, if the ice is quite fresh, minute spherical bubbles one directly above another, like a string of beads.
A military organization may be quite correctly compared to a cone, of which the base with the largest diameter consists of the rank and file; the next higher and smaller section of the cone consists of the next higher grades of the army, and so on to the apex, the point of which will represent the commander-in-chief.