Thus we have now before us a pale, spindle-shaped figure, which takes only a faint stain, with the 'suns' (_cs_) at its 'poles,' and in its equatorial plane the loop- or rod-shaped, or spherical chromosomes (_chrs_). The whole is designated the 'karyokinetic,' the 'mitotic,' or the 'nuclear division figure.' The meaning and importance of this, at first sight, puzzling figure will at once become clear from what follows. It may be observed at this stage, if not even long before, that each of the chromatin rods or loops has split along its whole length like a log of wood, and that the split halves are beginning slowly and hardly noticeably to move away from each other, one half towards one, the other towards the other pole of the spindle (Fig. _D_ and _F_). Directly in front of the centrosome they make a halt, and now the material for the two daughter-nuclei is in its proper place (_F_, _chrs_). These develop quickly, each chromosome group surrounding itself with a nuclear membrane (Fig. _G_) within which the chromosomes gradually become transformed again into a nuclear network. Within the chromatin substance proper this is scattered about in small roundish or angular granules, lying especially at the intersecting points of the network. It may be stated at once, though the full significance of the statement can only be appreciated later, that we may assume with probability that this breaking up of the chromosomes is only apparent, and that these rods or spheres really continue to exist in the nuclear network, only in a different form, greatly spread out, somewhat after the manner of a Rhizopod which stretches out fine processes in all directions. These processes branch and anastomose, so that the body, which previously seemed compact, now appears as a fine network. In point of fact, it can be directly observed that the chromosomes, after the nucleus is completely divided into two daughter-nuclei, send out pointed processes (_F_ and _G_) which gradually increase in length and branch, while the body of the chromosome itself becomes gradually smaller. It is thus probable that, when such a daughter-nucleus is on the point of dividing anew, it may, by a drawing together of the processes or pseudopodia of the chromosomes, produce the same rods or spheres as those which previously gave rise to the network. More definite reasons for this interpretation will be adduced later on. In any case, the chromosomes, even in their compact rod-like state, consist of two kinds of substance, the chromatin proper, which stains deeply, and the linin, which is difficult to stain; and it is the latter which, by breaking up, forms the pale part of the nuclear network.