PHTSIOLOGT 41 



salt solutions (provided they are not too concen- 

 trated). Since these salts are largely ionized 

 this may be regarded as evidence of permeability 

 to ions. It is, however, quite possible that in 

 these experiments the cells are readily per- 

 meable to ions only because they are abnormal. 

 It is well known that plasmolysis produces in- 

 jury and that injury is accompanied by changes 

 in permeability. It is also possible that the cells 

 may subsequently recover from such injury 

 and appear to be normal j in this case the per- 

 meability to ions would be only a temporary one. 

 Injury might affect only a portion of the cell 

 surface (possibly numerous small areas). Ex- 

 periments on large multinucleate cells ( Valonia, 

 Nitellay Caulerfay Bryofsis) indicate that a por- 

 tion of the cell surface may be greatly altered 

 while the remainder remains in normal condition 

 for a long time afterward. 



If recovery from plasmolysis in salt solutions 

 depends on alterations of permeability we 

 should expect the rate of recovery from plas- 

 molysis to correspond somewhat with the 

 amount of alteration. If the alteration goes too 



