Experiment III. 



The single method again compares badly, only 5 incisions were 

 opened daily hence the long period, 23 days, of tapping. As com- 

 pared with trees of the same size it will be noted that the oblique 

 incisions were on alternate days. The advantage of tapping on 

 alternate days is also shown with the herring-bone method both 

 morning and evening tappings. 



