10 



DROSERA ROTUNDIFOLIA. 



Chap. 1. 



The tentacles in the act of inflection sweep through 

 a wide space ; thus a marginal tentacle, extended in 

 the same plane with the blade, moves through an angle 

 of 180^ ; and I have seen the much reflected tentacles 

 of a leaf which stood upright move through an angle 

 of not less than 270^ The bending part is almost 

 confined to a short space near the base ; but a rather 

 larrrer portion of the elongated exterior tentacles 



Fio. 4. 



{Drosera rotundifolia.) 



Loaf (onliirgod) with all the tentacles 

 closely intic ctcd, from immorsion in a 

 Bolutioti of i)hosplKit(' of ammonia (one 

 part to 87,500 of water). 



Fig. 5. 



(Dmsera rotundifolia.') 



Leaf (enlarged) with the tentacles on one 

 side inflected over a bit of meat placed 

 ou the disc. 



becomes sliglitly incurved ; the distal half in all cases 

 remaining straight. The short tentacles in the centre 

 of the disc when directly excited, do not become in- 

 flected ; but they are capable of inflection if excited 

 by a motor impulse received from other glands at a 

 distance. Thus, if a leaf is immersed in an infusion 

 of raw meat, or in a weak solution of ammonia (if the 



