318 PINGUICULA LUSITANICA. [Cuar. XVI. 
(7) The flower-peduncles, sepals and petals bear glands in general 
appearance like those on the leaves. A piece of a flower-peduncle was 
therefore left for 1 hr. in a solution of one part of carbonate of 
ammonia to 437 of water, and this caused the glands to change from 
bright pink to a dull purple colour; but their contents exhibited no 
distinct aggregation. After 8 hrs. 30 m. they became colourless. Two 
minute cubes of albumen were placed on the glands of a flower- 
peduncle, and another cube on the glands of a sepal; but they were 
not excited to increased secretion, and the albumen after two days was 
not in the least softened. Hence these glands apparently differ greatly 
in function from those on the leaves. 
From the foregoing observations on Pinguicula lusitanica we 
see that the naturally much incurved margins of the leaves 
are excited to curve still farther inwards by contact with 
organic and inorganic bodies; that albumen, cabbage seeds, 
bits of spinach leaves, and fragments of glass, cause the 
glands to secrete more freely ; that albumen is dissolved by 
the secretion, and cabbage seeds killed by it; and lastly that 
matter is absorbed by the glands from the insects which are 
caught in large numbers by the viscid secretion. The glands 
on the flower-peduncles seem to have no such power. ‘This 
species differs from Pinguicula vulgaris and grandiflora in the 
margins of the leaves, when excited by organic bodies, being 
inflected to a greater degree, and in the inflection lasting for 
a longer time. ‘The glands, also, seem to be more easily 
excited to increased secretion by bodies not yielding soluble 
nitrogenous matter. In other respects, as far as my observa- 
tions serve, all three species agree in their functional powers. 
