VEGETABLE CELLS.

PART II.

In the First Part of this essay I endeavoured to demon-strate, in the first place, that nuclei occur in all vegetablecells, and that they are utricles; secondly, that in onekind of cell-formation (which is called parietal cell-forma-tion), the whole contents of the parent-cell become dividedinto two or more portions, and that around each of thesea perfect membrane is formed by the secretion of gela-tinous substance, this membrane being in contact in partwith the wall of the parent-cell, in part with that of itsfellow secondary-cell. I shall hereafter find an oppor-tunity of defending my theories against some objectionswhich have since been made to them. I have delayedthe continuation of the essay, which is principally to treatof free cell-formation, because my observations have neverappeared sufficient to afford a quite positive conclusion.Even now, in spite of all my efforts, I have only arrivedat probabilities in my results on many points, which,however, I will not any longer keep back, but leave thefurther development and establishment of the doctrine toa happier time.

IV.—FREE CELL-FORMATION.a. Without visible nucleus.

In free cell-formation without a visible nucleus, the newcells originate, in the contents of the parent-cells, as mi-nute globular bodies, in which, so soon as they have