METABOLISM 



59 



FIG. 21. Leaf of the Venus' fly-trap : A, open ; B, closed. Note the 

 three sensitive hairs on each leaflet of A. 



Some plants, indeed, might be called, if not holo- 

 zoic, at least " amphizoic," since they have de- 

 veloped means of catching and killing living animal 

 prey. Of such are the familiar " Venus' Fly Trap " 

 (Dioncea), or the "Pitcher plant" (Nepenthes), 



FIG. 22. Two leaves of the sundew (Drosera rotundifolia) ; the 

 one to the right in the expanded condition, that to the left shortly after 

 the capture of an insect ; the tentacles of the right half are bent over to 

 bring the glandular tips in contact with the prey. Magnified 1\ times. 

 (From Barnes, after Kerner.) 



