316 PINGUICULA LUSITANICA. [Cuar. XVI. 
going ones. The leaves are rather smaller, much more 
transparent, and are marked with purple branching veins. 
The margins of the leaves are much more involuted ; those of 
the older ones extending over a third of the space between 
the midrib and the outside. As in the two other species, the 
glandular hairs consist of longer and shorter ones, and have 
the same structure; but the glands differ in being purple, 
and in often containing granular matter before they have 
been excited. In the lower part of the leaf, almost half the 
space on each side between the midrib and margin is destitute 
of glands; these being replaced by long, rather stiff, multi- 
cellular hairs, which intercross over the midrib. These hairs 
perhaps serve to prevent insects from settling on this part of 
the leaf, where there are no viscid glands by which they 
could be caught; but it is hardly probable that they were 
developed for this purpose. The spiral vessels proceeding 
from the midrib terminate at the extreme margin of the leaf 
in spiral cells; but these are not so well developed as in the 
two preceding species. The flower-peduncles, sepals, and 
petals, are studded with glandular hairs, like those on the 
leaves. 
The leaves catch many small insects, which are found 
chiefly beneath the involuted margins, probably washed there 
by the rain, The colour of the glands on which insects have 
long lain is changed, being either brownish or pale purple, 
with their contents coarsely granular ; so that they evidently 
absorb matter from their prey. Leaves of the Erica tetralix, 
flowers of a Galium, scales of grasses, &c., likewise adhered to 
some of the leaves. Several of the experiments which were 
tried on Pinguicula vulgaris were repeated on Pinguicula 
lusitanica, and these will now be given. 
(1) A moderately sized and angular bit of albumen was placed on 
one side of a leaf, halfway between the midrib and the naturally 
involuted margin. In 2 hrs. 15 m. the glands poured forth much 
secretion, and this side became more infolded than the opposite one. 
The inflection increased, and in 3 hrs. 30 m. extended up almost to the 
apex. After 24 hrs. the margin was rolled into a cylinder, the outer 
surface of which touched the blade of the leaf and reached to within 
the 5 of an inch of the midrib. After 48 hrs. it began to unfold, and 
in 72 hrs. was completely unfolded. The cube was rounded and 
greatly reduced in size; the remainder being in a semi-liquefied 
state. 
(2) A moderately sized bit of albwmen was placed near the apex of 
