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Otis F. Curtis 



one to fourteen days with sugar solutions, but that continuous treatment 

 with the same solutions tends to retard root formation in both immature 

 and mature cuttings. The immature cuttings used in the experiments 

 just discussed were found to have little starch stored in the stem. As 

 shown by other experiments, less striking results were obtained when 

 maturer twigs were used. In these experiments, partly matured upper 

 parts of the twigs were used, but these were taken later in the season and 

 had been subjected to several frosts. 



Six experiments were set up in which mature Ligustrum cuttings were 

 treated for from two to fifteen days with sugar of from 0.2 to 0.4 molecu- 

 lar concentration. No very marked effects on root growth were obtained 

 at any time when mature cuttings were treated with sugar. Usually 

 the treatment resulted in a somewhat increased top growth, but this 

 was not very striking. There was, on the other hand, a peculiar and 

 marked effect on the nature of the top growth. Normally the buds 

 at the uppermost node of each cutting produce the strongest shoots, 

 while the buds at the other nodes remain dormant or produce only weak 

 shoots. For the twigs treated with sugar, however, there was in each 



TABLE 17. Effect op Various Organic Compounds on Mature Cuttings op 



Ligustrum 



