4-20 Macfar lane.— Observations on Pitcher ed 
that gardeners, in attempting to fertilize, may have detached 
dry pollen which had not been nectar-smeared, and this when 
applied to the stigma may have been so dry as to render it 
inoperative. Speaking on this subject to Mr. Pope, of Glas- 
nevin Garden, Dublin, he at once stated that he always 
selected nectar-smeared pollen to effect fertilization. An 
interesting line of experiment is here suggested, which may 
bear practical results. 
V. Histology of Nepenthes, with Remarks on 
Adaptations for Insect-catching. 
This section of the present paper may best be understood 
if a general review of the comparative morphology of the 
species be first given. 
N. ampidlaria and N. Lowii are types which point to 
a simpler condition of pitcher from which they have both been 
derived, and which in form would approach the Sarracenioid 
alliance. Resembling N. Lowii in being a tube with simple 
non-corrugated or slightly corrugated rim, such a form would 
foreshadow N. ampidlaria in the rudimentary condition of its 
lid, the absence or small number of attractive lid-glands, and 
the simple unconstricted shape of the pitcher. But with such 
a primitive form we must associate a higher degree of histo- 
logical differentiation than is shown even by Heliamphora , the 
most specialized in its pitcher of the Sarracenioids, for the 
presence of regularly disposed attractive marginal glands in 
the leaves that appear after the cotyledons is of considerable 
importance. 
As indicated in seedlings, such a primitive type would have 
an uninterrupted lamina, would be elongate-tubular in shape, 
with a simple pitcher-margin ; the lid would be of small size, 
and would stand upright, or even be inclined back at an angle 
in mature pitchers. The lamina would have flat glands com- 
pletely exposed, the simple margin would be encircled with 
attractive marginal glands sunk in fossae, and the whole 
interior of the pitcher-cavity would show glands similar in 
structure to the laminar ones, but differing in their secretion. 
