86 



Otis F. Curtis 



Fig. 2. cuttings of prunus cerasifera as affected by treatment with potassium 



permanganate 



The twigs at the left of the rule were kept continuously in 0.001 mol. KMn04; those at the right were 



kept continuously in water 



^ -«■ 





Fig. 3. cuttings of prunus cerasifera as affected by treatment with potassium 



permanganate 



Top row: Check. Twigs from flasks containing water alone 

 Middle row: Twigs from flasks containing 0.005 mol. KMn04 

 Bottom row : Twigs from flasks containing 0.001 mol. KMnOj 



