3t7 
a thin slice from the cut surface for a number of occasions say 
8-12 times although it has not been possible to lay down any 
definite number owing to the different behaviour of trees in res- 
ponding to this wound-effect, I notice however, that in some 
experiments conducted by Mr. Ridley at the Singapore Botanical 
Gardens that better results were obtained by making a new incision 
a few inches away from the old one, than by renewing the old 
incision as described above; and as these results are opposed to 
those hitherto obtained by" me I have been induced to repeat my 
experiments in this direction. 
In the following experiment 10 trees were tapped with V shaped 
incisions. On one side of the tree a V incision was made at 6 ' from 
the base, another at 3' from the base and another dose to the base 
of the trunk. The two lines forming the V were 6" long in each 
case and the incisions were renewed on four alternate days. On 
the opposite side of the same tree a similar incision was made at 
6' from the ground, another at 5' 6 " and so on every 6" until the 
base of the tree was reached, there being 12 incisions in all. Three 
of these incisions were made each day, the base being reached on 
the fourth day. The results are given in Table 21 and show very 
clearly the advantage of renewing the old incision although the 
difference would probably not have been so great had only one 
incision been made on each side of the tree, as no doubt the flow 
from one wound interfered to some extent with the flow from the 
others dose by. The reason for opening three incisions each dav 
was so that the exposed surface would equal that of the incisions 
on the opposite side of the tree at the same time and therefore 
avoid any chance of the results being influenced by climatical 
conditions. 
* 
'bn/ 
