320 DIONZA MUSCIPULA. Crap. XIII 
must have been equally affected; and I can under- 
stand the divergence of the lobes only by supposing 
that the cells on the lower side, owing to their state of 
tension, acted mechanically and thus suddenly drew 
the lobes a little apart, as soon as the cells on the 
upper surface were killed and lost their contractile 
power. We have seen that boiling water in like 
manner causes the tentacles of Drosera to curve back- 
wards; and this is an analogous movement to the 
divergence of the lobes of Dionza. 
In some concluding remarks in the fifteenth chapter 
on the Droseracex, the different kinds of irritability 
possessed by the several genera, and the different 
manner in which they capture insects, will be com- 
pared. 
