PLATE lY. 
Fig. 
12, 12*.— Capsule cells. 
13. — Capsule cells, without nuclei. 
14. — ■ „ „ nuclei formed ; cell-increase proceeding by sub-division. 
16, 17, 18. — Yery earliest stages of cell-formation. 
19. — Cell-increase by recession of granular contents to one side, — as dis- 
played by colouring. ..: 
20. — Early cell- formation, coloured. 
21. — Lower portion of a root of wheat coloured ; the capsule-cells strongly 
painted; the pith-tube coloured; the colour decreased as growth 
proceeds ; the parenchyma colourless. 
22. — Absorption by a parasitic fungus, of coloured matter taken up by 
Anacharis. 
23. — Shows well the nucleus with its nucleolus, in the "ovate vesicle;" 
from the large cell-structure surrounding the ''sap-tube." 
24. — Commencing formation of nuclei, and consequent increase in depth 
of colour, from base of a maize root. 
25. — Nuclei perfectly formed, cell-contents reduced in quantity and depth 
of colouring. 
26. — Taken from a little higher up the root. Nuclei alone left, the cell- 
contents having more or less disappeared. 
27. — Cell-growth by the formation of a septum or septa, dividing individual 
cells into two or three ; the walls frequently seem to be composed of 
several layers of plasma maize. 
28. — Cells containing double and triple nuclei, sometimes two in one 
vesicle. 
