CHAPTER XVI.. Pinguicula.

PINGUICULA. Pinguicula vulgaris—Structure of leaves—Number of insects and other objects caught—Movement of the margins of the leaves—Uses of this movement—Secretion, digestion, and absorption—Action of the secretion on various animal and vegetable substances—The effects of substances not containing soluble nitrogenous matter on the glands—Pinguicula grandiflora—Pinguicula lusitanica, catches insects—Movement of the leaves, secretion and digestion.