262 Scott and Sargant—On the Pitchers of 
hairs, as mentioned above, attach themselves to any particles 
of humus which they meet with. The exodermis has fewer 
passage-cells in the same length, which may possibly indicate 
less active absorption. The rootlets, where they adhere to the 
substratum, are often much flattened, and sometimes show 
a dorsiventral structure. The sclerenchyma is mainly limited 
to the free side, while the external periderm first forms on 
the side towards the adherent surface. A particularly good 
example of the structure in question was found in an adven- 
titious root of another species, D. bengalensis , Colebrooke 1 , 
which we have therefore figured in transverse section (Fig. 14). 
On the whole the free adventitious roots have decidedly fewer 
sclerotic elements than the pitcher-roots. 
Internal Phloem in the Root. 
The roots of the Java specimens showed no anatomical 
anomalies. It was therefore surprising to find that the roots 
in the pitchers of the same species sent to Kew from Burmah 
possessed well-developed medullary phloem, a rare peculiarity 
in the root. 
Three pitchers from Burmah were available for histological 
examination. In one the root was so shrivelled that its struc- 
ture could not be investigated. Both the other two had internal 
phloem. 
All the roots in the Burmah pitchers were very well de- 
veloped. They were abundantly branched, and their rootlets 
formed a tangled mass, pressed closely against the bottom 
and sides of the pitcher, among the detritus which it contained. 
When pulled out, the mass of rootlets retained the form of the 
pitcher, just as do the crowded roots removed from a flower- 
pot. The flattened rootlets were decidedly dorsiventral, the 
differences between the adherent and free sides being in all 
respects as marked as in the adventitious root of D. ben- 
galensis , which we have figured (Fig. 14). 
The main root in each pitcher was swollen here and there, 
1 Trans. Linn. Soc. vol. xii. 1819, p. 357, PI. 15. 
