186 DROSERA ROTUNDIFOLIA. [Chap. IX. 



other irritable plants it is known* that the exclusion of 

 oxygen prevents their moving, and arrests the movements of 

 the protoplasm within their cells, but this arrest is a different 

 phenomenon from the retardation of the process of aggre- 

 gation just alluded to. Whether this latter fact ought to be 

 attributed to the direct action of the carbolic acid, or to the 

 exclusion of oxygen, I know not. 



Sachs. ' Tralte de Bot.' 1874, pp. 846, 1037. 



