1901] ~ MICROSCOPICAL JOURNAL. 293 
met within the leaves of some other plants, which how- 
ever had no flowers or fruit to give a clue to their names. 
But one of these deserves special mention because the 
diaphragms are so different from those heretofore de- 
scribed. It is a rush-like plant, probably a Triglochin, 
with very narrow leaves about a foot long and oval in 
cross section. Here the cell joints are swelled so that, at 
first sight, they appear like interposed globular cells. 
The apertures are therefore triangles each of whose sides 
has a curved indentation. | 
(7 a4 
, \ 
o io I 
Cr) 
ati 
J ss 
\ 
WY y 
jy 
Z 
A r\ 
ty S) 
) = DA 
UW? 8 ‘ 
> “SR AE 
& 
Fig. 21 is a cross section, enlarged 18 times. Fig. 22 
shows some of the air-passages and diaphragms on a scale 
of 7to 1. Fig. 23 represents part of a partition magni- 
fied 175 times. But as this last was not drawn directly 
from the object, it is a little too regular. 
It is evident that in the structure of organs with large 
air-chambers and ethmoid partitions, considerable firm- 
ness is secured with a minimum of solid material. At 
the same time the free circulation of air in all parts con- 
