CLASSIFICATION OF PROTOCOCCUS. 



Kingdom — Plantie, because it possesses a cuUiila^ wall, absorbs CO- and evolves 0. 

 Sub-Kingdom — Thallophyta. 

 Urunp — Algaj, 



CHARA. 



Fia. 1 («). Showing — 



. , f ISTodcs (L. vodiis, a knot). 



( Internodes (L. inter, between). 



, f Leaves arranged in whorls. 



Appendages s -„ , 



( Branches. 



( Nodes. 



BiiAis'OH . . •; Internodes. 



( Appendages. 



™ T, f N"odes with their leaves. - 



( bhort internodes. 



Fig. 1 {!>). Showing the Cortical Layer investing tue Inteknodal Cell (L. cortc; liarl<). 



Fig. 2. Transverse Section of Internode. Showing — 



Cortex. 



Wall of internodal cell. 



Protoplasm lining the wall, the so-called primordial utricle (L. primordius, original ; vtriculus, 



a little bag). 



Chlorophyll granules arranged so as to leave an uucoloured portion, the neutral lino. 



Inner layer of protoplasm — the moving layer. 



Vacuole, filled with cell-sap. 



Fig. .3. Showing the Node — 



A surface of cells one layer thick. 



Fig. 4. The Terminal Bud dissected to lay bare the Growing Point. Showing — 



The hemispherical apical cell. It grows in length and nndtiplies by division transverse to the axis. 



The cell immediately beneath apical cell afterwards divides transversely into two portions— the 



lower an internode, the upper a node. 



The internodal cell (blue). It elongates, but does not divide at all. 



The nodal cell (uncoloured). It does not elongate, but divides parallel to the axis, so as to form 



a transverse partition of cells. 



Nodal cell originating a young leaf. 



Nodal cell originating the cortex. 



Fig. 5. Portion of Leaf. Showing — 



The uncovered apical or terminal cell. 



Nodal cell. 



P ,, J Descending lobes. 



I Ascending lobes. 



Fig. G. jMovements of the Protoplasm — 



The arrows represent the direction of the currents of protoplasm. 



The uncoloured bands are the neutral lines (see fig. 2). 



DiAGKAM I. Showing Formation of Cortex. 



The peripheral cells of the node (shown in fig. 3) send pockets upwards and downwards to 

 form the ascending and descending cortical lobes. 



