91 
ARTICLE LV. 
On the Structure of the Vegetable Cell. By Huco Mout. 
[From the Botanische Zeitung, April 12th, 19th, 26th; May 3rd, 10th*.] 
In my phytotomical researches I have frequently met with iso- 
lated appearances which were not exactly opposed to the views 
I had previously advanced, that the septa of cells and vessels 
consist of two membranes overlying each other,—a primary, 
external and imperforate, and a secondary generally pierced 
with apertures,—but which phenomena I did not know how 
to connect with others previously known to me. An eva- 
nescent appearance which I had only once met with, and which 
at the time made a considerable impression on me, referred 
particularly to this point. Some years ago, when examining 
a fresh Jungermannia under water, I observed in a cell of one 
of the leaves, that the chlorophylle granules did not lie upon 
the wall of the cell, as is usually the case in the Jungermannie, 
and also occurs in other cells of leaves, but were united, in the 
middle of the cell, into a globular mass which suddenly expanded, 
assumed the form of a thin membranous cell inclosing the chloro- 
phylle granules, and quickly increasing in size, after a few seconds 
filled the whole space of the leaf-cell, and then could no longer 
be distinguished from the primary wall, to which it closely ap- 
plied itself. In this appearance, at first unintelligible to me, a 
peculiar condition of structure presented itself, a more accurate 
examination of which baffled my endeavours for a long time. 
But when Kutzing recently made known that the elementary 
organs of the Algz consist of cells inclosed one within another, 
which view he has since set forth more distinctly and illus- 
trated by beautiful drawings in his ‘ Phycologia generalis ;? when 
Meneghini, with whom I discussed this view, told me that he 
also admitted the existence of an inner cell in Zygnema, and 
Hartig+ advanced a theory of the mode of development of cel- 
lular membrane diametrically opposed to mine, I found myself 
called upon to submit the cell-wall structure to further ob- 
servation. 
* Translated by Arthur Henfrey, M.R.C.S., F.L.S. 
+ Beitrage xur Entwicklungsgeschichte der Pflanzen. 1843. 
