The absolute division of the nucleus has been stated to occur in animal cells, but the number of instances where the evidence is quite conclusive are not very numerous. Recently F. E. Schultze[83] appears to have observed it in the case of an Amoeba in an altogether satisfactory manner. The instance is quoted by Flemming[84]. Schultze saw the nucleus assume a dumb-bell shape, divide, and the two halves collect themselves together. The whole process occupied a minute and a half and was shortly followed by the division of the Amoeba, which occupied eight minutes. Amongst vegetable cells the division of the nucleus seems to be still rarer than with animal cells. Sachs[85] admits the division of the nucleus in the case of the parenchyma cells of certain Dicotyledons (Sambucus, Helianthus, Lysimachia, Polygonum, Silene) on the authority of Hanstein. Footnote 83: _Archiv f. Micr. Anat._ XI. p. 592. Footnote 84: "Entwicklungsgeschicte der Najaden," LXXI. Bd. _der Sitz. der k. Acad. Wien_, 1875. Footnote 85: _Text-Book of Botany_, English trans. p. 19. The division of the nucleus during cell-division, though seemingly not very common, must therefore be considered as a thoroughly well authenticated occurrence. The frequent disappearance of the nucleus during cell-division is now so thoroughly recognised, both for animal and vegetable cells, as to require no further mention. In many cases the partial or complete disappearance of the nucleus is accompanied by the formation of two peculiar star-like figures. Appearances of the kind have been described by Fol[86], Flemming[87], Auerbach[88] and possibly also Oellacher[89] as well as other observers. Footnote 86: "Entw. d. Geryonideneies." _Jenaische Zeitschrift_, Bd. VII. Footnote 87: _Loc. cit._ Footnote 88: _Organologische Studien_, Zweites Heft. Footnote 89: "Beiträge z. Entwicklungsgeschichte der Knochenfischen." _Zeit. für Wiss. Zoologie_. Bd. XXII. 1872. These figures[90] are possibly due to the streaming out of the protoplasm of the nucleus into that of the cell[91]. The appearance of striation may on this hypothesis be explained as due to the presence of granules in the protoplasm. When the streaming out of the protoplasm of a nucleus into that of a cell takes place, any large granule which cannot be moved by the stream will leave behind it a slack area where there is no movement of the fluid. Any granules which are carried into this area will remain there, and by the continuation of a process of this kind a row of granules may be formed, and a series of such rows would produce an appearance of striation. In many cases, _e.g._ Anodon, vide Flemming[92], even the larger yolk-spherules are arranged in this fashion.