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 vegetable 

 cells, and that they are utricles ; secondly, that in one 

 kind of cell-formation (which is called parietal cell-forma- 

 tion), the whole contents of the parent-cell become divided 

 into two or more portions, and that around each of these 

 a perfect membrane is formed by the secretion of gela- 

 tinous substance, this membrane being in contact in part 

 with the wall of the parent-cell, in part with that of its 

 fellow secondary-cell. I shall hereafter find an oppor- 

 tunity of defending my theories against some objections 

 which have since been made to them. I have delayed 

 the continuation of the essay, which is principally to treat 

 of free cell-formation, because my observations have never 

 appeared sufficient to afford a quite positive conclusion. 

 Even now, in spite of all my efforts, I have only arrived 

 at probabilities in my results on many points, which, 

 however, I will not any longer keep back, but leave the 

 further development and establishment of the doctrine to 

 a happier time. 



IV. FREE CELL-FORMATION. 



a. Without visible nucleus. 



In free cell-formation without a visible nucleus, the new 

 cells originate, in the contents of the parent-cells, as mi- 

 nute globular bodies, in which, so soon as they have 



