Cuar. 1] ACTION OF THE PARTS. 9 
scen 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 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 inflected ; 
but they are capable of inflection if excited by a motor 
impulse received from other glands at a distance. Thus, ifa 
Fig. 4. Fie. 5. 
(Drosera rotundifolia.) (Drosera rotundifolia.) 
Leaf (enlarged) with all the tentacles Leaf (enlarged) with the tentacles on one 
closely inflected, from immersion in a side inflected over a bit of meat placed 
solution of phosphate of ammonia (one on the disc. 
Part to 87,500 of water). 
Jeaf is immersed in an infusion of raw meat, or in a weak 
solution of ammonia (if the solution is at all strong, the leaf 
is paralysed), all the exterior tentacles bend inwards (see 
fig. 4), excepting those near the centre, which remain 
upright; but these bend towards any exciting object placed 
on one side of the disc, as shown in fig. 5. The glands in 
fig. 4 may be seen to form a dark ring round the centre; and 
this follows from the exterior tentacles increasing in length 
in due proportion, as they stand nearer to the circumference. 
