31? 
a tliin  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.  RlULEV  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  mv 
experiments  in  this  direction. 
In  the  following  experiment  lo  trees  were  tapped  with  V shaped 
incisions.  On  one  side  of  the  tree  a incision  was  made  at  6'  from 
the  base,  another  at  3'  from  the  ba-^e  and  another  close  to  the  base 
of  the  trunk.  fhe  two  lines  forming  the  V were  6'^  long  in  each 
case  and  the  incisions  were  riMiewed  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  tr^  e was  reached,  tliere  being  12  incisions  in  all.  Three 
of  these  incisions  were  made  each  day,  the  base  being  reached  on 
thg  fourth  day.  The  results  are  given  in  Taale  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  e.stent  with  the  flow  from  the 
others  close  by.  The  reason  for  opening  three  incisions  each  day 
was  so  that  the  exposed  surface  would  equal  tliat  of  the  incisions 
on  the  opposite  side  of  the  tree  at  the  sa?ne  time  and  therefore 
avoid  any  chance  of  the  results  being  influenced  by  climatical 
conditions. 
