I 



— Plate 37. — ^ 



Moving pictures showing the action of the trap of Utrkularia, and of the sensitive hairs 



of Dionaea (all frames are 1/16 sec. apart, except in fig. 2, in which they are 1/160 sec. ; 



apart, and in fig. lA, which is time lapse); — 



Fig. ik. — Utrkularia purpurea. Trap showing the exhaustion of the 



contained water and the consequent collapse of the walls, indicated ^ 



by the distortion of a contained bubble of air. Moving picture: , 



time lapse spread over about 2 hours. J 



Fig. iB. — The same, viewed edgewise, before and after action. i 



Fig. 2. — U. vulgaris. View looking into the entrance showing the open- , 



ing of the door (in 1/160 sec.) and the subsequent closing in 4/160 \ 



sec. The open door is seen in the third frame from top. The round 1 



object in front of the door is the knob of a glass probe. ; 



Fig. 3. — t^. vulgaris. The capture of a copepod. The trap was set in a 



shallow glass tank with walls to guide the copepod to the mouth of 1 



the trap. ' 

 Fig. 4. — The same. The lateral profile of a trap before and after {below) 



actuation. 

 Fig. 5. — Dionaea muscipula. Bending and straightening of a sensitive 



hair. 

 Fig 6 _The "Darwin experiment," referred to in the text: the sudden 



disappearance of colored particles (here particles of carbon) resting on I 



the door, on its actuation by a needle point slowly moved across the '■ 



entrance. 

 Fig. 7. — U. gibba, capturing a larva. 



Fig. 8. — U. purpurea. A trap swallowing a bubble. _ = 



Fig. 9. — U. vulgaris. Trap swallowing a glass bead and, in doing so, 



jumping at the probe. The trap had been removed from the plant. 



