444 Macfarlane . — Observations on Pitcher ed 
folding of the gland with restriction of the exposed surface, 
but in N. Pervillei this is carried to such an extent that each 
gland opens by a very narrow elongated orifice. The shape 
of the lid-glands, therefore, and those of the sepals is identical. 
But this does not follow in all cases, for in N. Lowii , with 
huge perithecioid lid-glands (Fig. 16), the sepals have large 
but open or only slightly constricted orifices. 
The amount of nectar secreted is in all cases great. 
Mr. Burbidge tells me that when flowering the inflorescences 
are constantly surrounded by clouds of small insects that buzz 
round them or alight to sip the juice. 
The pistil does not call for special note. 
VII. Arrangements for Pollination in Flowers of 
Nepenthes and Cephalotus. 
Nepenthes . The flowers being so small and the sepals so in- 
conspicuous individually, one might have expected that wind- 
pollination would take place: but an entire raceme presents 
a decidedly striking contrast in the midst of surrounding foliage, 
and the nectar being copious, any insects attracted are amply 
rewarded. That pollination is usually effected by aid of the 
hosts of small insects which hover over the flowers is, as Mr. 
Burbidge thinks, extremely probable, and the dioecious habit 
of the plants renders a passage from one to another necessary. 
But that the outer surface of the sepals in several species and of 
the flower-stalks in N. Pervillei , and occasionally in N. bical- 
car ata and other species, should be honey-baited, suggests the 
alluring to them in some cases of such running insects as 
frequent the pitchers, viz. ants, &c. 
In our hot-houses these insects visit them in numbers after 
traversing stems from ten to twenty feet long. Their careful, 
inquisitive movements, and examination of everything in their 
path, suggests that they may carry pollen in a locality where 
Nepenthes scramble amongst the undergrowth. 
Cephalotus. Professor Dickson drew attention to the 
extremely diffuse condition of the alluring glands in this 
genus, which are scattered over the outer surface and stalks of 
