254 Macfarlane . - — Observa tions on 
In this paper I will present my results under the following 
heads : — 
1. General morphology of the pitchers. 
2. Histology of Darlingtonia , Sarracenia , and Heliamphora , 
with remarks on adaptations for insect catching. 
3. General morphology and histology of the flowers of 
these. 
4. Arrangements for pollination in the flowers of Sar- 
racenia . 
5. Histology of Nepenthes , with remarks on adaptations for 
insect catching. 
6. General morphology and histology of the flowers of 
Nepenthes . 
7. Arrangements for pollination in the flowers of Nepenthes 
and Cephalotns . 
8. On hybridity and relation of the species to each other in 
the different genera. 
Ordinary methods were adopted in sectioning and mounting. 
For the obtaining of large epidermal surfaces showing the re- 
lative distribution of glands a special method was adopted 1 . 
The pitchers were macerated in strong boiling potash solution, 
and this, though destroying the cuticle, gave large transparent 
pieces in which the form of ordinary epidermal cells, gland 
and hair cells, was well illustrated. 
I. General Morphology of the Pitchers. 
Professor Dickson has fully elucidated the morphology of 
the Cephalotns pitcher 2 , so that I only require to draw atten- 
tion to the flowers of that genus in a later part of my paper. 
NEPENTHES. 
This genus, though highly specialised both in leaf form 
and glandular development, is the one which may most con- 
veniently be examined first. In all the known seedlings of 
1 Brit. Assoc. Report. Aberdeen, 1885. 
2 Journ. of Bot. N.S. Vol. VII (1878) ; also Vol. X (1881). 
