CARNIVOROUS PLANTS WITH ADHESIVE APPARATUS. 155 
otherwise interested in the vegetable world are impressed by the sight of a plant 
with its leaves covered with a number of insects adhering to them as though they 
were limed twigs. In the neighbourhood of Oporto, where Drosophyllum grows 
abundantly, the peasants use these plants instead of limed twigs, hanging them up 
Ss 
Fig. 30.—The Fly-catcher (Drosophyllum lusitanicum). 
in their rooms, and so getting rid of numbers of troublesome flies which stick to 
them and are killed. 
A number of other plants have the power, though in a less conspicuous degree 
than Drosophyllum, of obtaining additional nitrogenous food out of adherent 
animals by means of secretory and absorptive glands. Such are many species of 
primulas, saxifrages, and house-leeks, which bury their roots in cracks and crevices 
of rock (eg. Primula viscosa, P. villosa, P. hirsuta, Saxifraga luteo-viridis, 8. 
bulbifera, S. tridactylites, Sempervivum montanwm), secondly, caryophyllaceous 
