120 ON THE ANATOMY OF 
Parenchyma. This evidently consists in all these species, 
and in all leaves, of green bodies, contained in distinct cells or 
vesicles. These cells leave strong impressions on the cuticle, 
to which they are attached. Besides these impressions, there 
are others smaller, ovate or semicircular, attached to the edges, 
or lines of junction of the cells, they are only visible when the 
cutis is observed internally. These globules are again composed 
of green corpuscles of unequal size. I am unable to state 
whether these again are contained in separate cellules. 
M. Mirbel states that in Marchantia the green matter is 
contained in spherioles, small vesicles attached to the mem- 
branes. They are broken up on the application of pressure, 
the vesicles then appear to be filled with an infinity of green 
corpuscles, spirit destroys almost entirely the green colour, 
the globules then appear of a dingy greenish and opaque 
brown. The globules on escaping into the water in which 
the object is immersed, appear to have a lively rotatory motion. 
Stomata. 1 have said that these abound in the leaves of all 
the species, this may appear strange, since these appendage in 
the E. setaceum are always submerged on sheaths and pedun- 
cles. In all, they are visible to the naked eye, appearing like 
small elevated white papille, arranged irregularly on the green 
spaces of the above organs. "They are of general occurrence, but 
of small number in the leaves of E. setaceum, but their structure 
is the same as those on the emerged parts, and as perfect. 
In all the species I have examined, they are of an oblong form, 
the cellules, contain, as usual, green granules, the opening 
being elevated above the surface. No better examples 
could be adduced to prove the correctness of Mr. 
Brongniart’s statement and drawings of the nature of these 
bodies. They communicate directly with the interior of the 
leaves, sheaths, and peduncles; the passage being invariably 
occupied by air. 
The communication is uninterrupted in the E. setaceum 
and two other species: no vesicles exist on the stomatose sur- 
