892 PINGUICULA LUSITANICA. Cuar. XVL 
ceeding 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 Hrica tetralix, 
flowers of a Galium, scales of grasses, &c. likewise 
adhered to some of the leaves. Several of the ex- 
periments 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 ulbumen 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 8 hrs. 80 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 », 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 albumen was placed near the 
apex of a leaf, under the naturally incurved margin. In 
2 hrs. 80 m. much secretion was excited, and next morning 
the margin on this side was more incurved than the opposite 
one, but not to so great a degree as in the last case. The margin 
unfolded at the same rate as before. A large proportion of the 
albumen was dissolved, a remnant being still left. 
(8) Large bits of albwmen were laid in a row on the midribs 
of two leaves, but produced in the course of 24 hrs. no effect; 
