10 



DROSERA ROTUNDIFOLIA. 



CHAP. I 



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 

 larger portion of the elongated exterior tentacles 



FIG. 4. 

 (Drosera rotundifolia.) 



Leaf (enlarged) with all the tentacles 

 closely inflected, from immersion in a 

 solution of phosphate of aannonla (one 

 part to 87,500 of water). 



FIG. 5. 

 (Drosera rotundifolia.') 



Leaf (enlarged) with the tentacles on one 

 side inflected over a bit of meat placed 

 on the disc. 



becomes slightly 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 



