90 



Otis F. Curtis 



table and by figures 5 and 6, the treatment with potassium permanganate 

 markedly increased root growth but had little or no effect on the tops. 

 In the cultures with 0.01 and 0.001 molecular potassium permanganate, 

 the roots were visible about ten days earher than they appeared in the 

 checks. This might seem to have been due to an effect on the rest period. 

 If this were the case, however, the treatment had not affected the whole 



Fig. 5. RELATION OF STIMULATION TO REST PERIOD 



Upper row: Cuttings taken early in rest period, October 15, 1915. Twigs at left, check twigs, kept 

 continuouslyiu distilled water until December 27, then placed in tap water. Twigs at right kept in 

 O.OI mol. KMnOi until December 27, then placed in tap water. The buds are ju8t.starting to grow in both 

 lots, showing ■approximately equal growth, while the root growth is very much greater in the treated twigs 



Lower row: Cuttings taken at end of rest period, on Decembers. Twigs at left, check twigs, left for 

 twenty-four hours in distilled water, then transferred to flasks containing distilled water. Twigs at right, 

 treated for twenty-four hours in 0.1 mol. KMn04, then transferred to fiasks containing distilled water. 

 The shoots are well formed in both sets, while the roots have not grown so far as in the twigs shown above. 

 Both roots and tops showed better growth in the treated twigs 



twig, for, tho a few buds were started by December 18, these were equally 

 developed on all the twigs whether treated or not. Altho these few buds 

 opened by December 18, most of the buds did not grow until about the 

 first of March. The equal development of the buds indicates that the 

 treatment has no effect on the resting condition of the whole twig. 



Effect on rest period of basal part. — The only possibility remaining, so 

 far as an effect on the rest period is concerned, is that the treatment 



