892 PINGUICULA LUSITANICA. Chap. XATE. 



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 Erica 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 albumen was 

 l^lactd 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 2^0 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 serai-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. 30 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. 



(3) Large bits of albumen were laid in a row on the midribs 

 of two leaves, but produced in the course of 24 hrs. no effect ; 



