Dischidia rajflesiana ( Wall .). 249 
towards the superior surface ; in the pitcher they are as 
constantly turned towards the outer surface. The anatomy 
thus indicates plainly that the inner surface of the pitcher 
corresponds to the lower surface of the leaf. 
As regards the distribution of the bundles in the lamina 
there is also a complete agreement between the two organs. 
The ramifications, which are not very abundant, traverse the 
middle layers of the mesophyll, without ever approaching 
closely to either surface. In the leaf however the minor 
branches are rather nearer to the upper than to the under 
surface, and in like manner the corresponding bundles in the 
pitcher lie nearer to the outer surface than to the inner. In 
both organs blind endings of the finer branch-bundles occur, 
as is usual in Dicotyledons. These also lie in the middle of 
the mesophyll. 
As regards the mesophyll itself there is a considerable 
difference between the pitcher and the leaf. The lamina of 
the leaf is about twice as thick as that of the pitcher. The 
texture of the latter is much harder than that of the former. 
This is due in part to the sclerenchyma, to be described 
immediately, but in part also to differences in the parenchyma 
of the mesophyll. 
In the foliage-leaf the tissues towards the upper aiid lower 
surfaces are alike, except that towards the upper surface the 
cells contain more chlorophyll-granules. Towards the middle 
of the mesophyll the cells are large, and somewhat elongated 
vertically to the surfaces : the cells here contain very few 
chlorophyll-granules. The mesophyll of the leaf, as a whole, 
is suggestive of an aqueous tissue, in which water may be 
stored. 
In the pitcher the cells are altogether smaller than in the 
leaf, and have thicker walls. Towards the outer surface they 
are closely packed and rich in chlorophyll. Near the inner 
surface the cells are irregularly branched with numerous 
triangular spaces between them. Figs. 2 and 3 represent, 
in sections parallel to the surface, the outer and inner layers 
of the mesophyll. 
