﻿INTRODUCTION". 
  

  

  A 
  working 
  plan 
  i> 
  simply 
  a 
  scheme 
  of 
  management 
  for 
  a 
  forest 
  

   tract. 
  To 
  prepare 
  it 
  a 
  thorough 
  study 
  must 
  be 
  made 
  not 
  only 
  of 
  the 
  

   present 
  character 
  of 
  the 
  forest, 
  but 
  also 
  of 
  its 
  capacity 
  to 
  furnish 
  

   future 
  yields 
  and 
  of 
  the 
  conditions 
  which 
  will 
  govern 
  the 
  transport 
  

   and 
  marketing 
  of 
  the 
  timber 
  cut. 
  Upon 
  this 
  study 
  is 
  based 
  a 
  system- 
  

   atic 
  plan 
  for 
  lumbering. 
  The 
  point 
  of 
  view 
  is 
  purely 
  practical: 
  the 
  

   purpose 
  is 
  to 
  prescribe 
  cuttings 
  which 
  will 
  not 
  only 
  pay. 
  but 
  will 
  also 
  

   tend 
  toward 
  the 
  gradual 
  and 
  sustained 
  improvement 
  of 
  the 
  forest. 
  It 
  

   is 
  a 
  business 
  policy 
  recommended 
  after 
  an 
  expert 
  investigation. 
  

  

  In 
  the 
  preparation 
  of 
  a 
  working 
  plan 
  two 
  important 
  points 
  to 
  be 
  

   determined 
  are: 
  (1) 
  The 
  amount 
  of 
  timber 
  standing: 
  {•!) 
  the 
  rate 
  at 
  

   which 
  the 
  principal 
  species 
  are 
  growing. 
  This 
  known, 
  it 
  is 
  possible 
  

   to 
  estimate 
  what 
  will 
  be 
  the 
  yield 
  of 
  timber 
  after 
  a 
  given 
  number 
  of 
  

   years, 
  and 
  also 
  to 
  calculate 
  the 
  amount 
  of 
  merchantable 
  timber 
  which 
  

   the 
  forest 
  is 
  capable 
  of 
  producing 
  each 
  year, 
  so 
  that, 
  if 
  desired, 
  the 
  

   annual 
  cut 
  may 
  be 
  made 
  equal 
  to 
  the 
  annual 
  production 
  and 
  a 
  sustained 
  

   yield 
  of 
  timber 
  be 
  assured. 
  

  

  On 
  the 
  tract 
  of 
  the 
  Sawyer 
  & 
  Austin 
  Lumber 
  Company 
  one 
  of 
  the 
  

   chief 
  objects 
  in 
  making 
  a 
  working 
  plan 
  was 
  to 
  determine 
  whether 
  the 
  

   present 
  tract 
  is 
  large 
  enough 
  to 
  furnish 
  a 
  sustained 
  yield 
  equal 
  to 
  the 
  

   yearly 
  capacity 
  of 
  the 
  mill, 
  and 
  if 
  not. 
  to 
  estimate 
  tin 
  1 
  additional 
  area 
  

   necessary 
  to 
  secure 
  such 
  a 
  re>ult. 
  

  

  The 
  .stand 
  of 
  timber 
  was 
  determined 
  in 
  the 
  following 
  way: 
  Strips 
  l<> 
  

   chains 
  long, 
  of 
  which 
  each 
  lo 
  chains 
  in 
  length 
  made 
  an 
  area 
  of 
  1 
  acre, 
  

   were 
  run 
  on 
  compass 
  courses 
  through 
  the 
  forest, 
  and 
  on 
  these 
  strips 
  

   the 
  diameters 
  of 
  all 
  pine 
  down 
  to 
  2 
  inches 
  and 
  hardwoods 
  down 
  to 
  10 
  

   inches 
  were 
  measured 
  with 
  the 
  calipers. 
  These 
  measurements 
  were 
  

   recorded 
  upon 
  tally 
  sheets, 
  a 
  separate 
  sheet 
  for 
  each 
  acre, 
  and 
  upon 
  

   them 
  notes 
  were 
  made 
  of 
  the 
  silvicultural 
  condition 
  and 
  the 
  merchant 
  

   able 
  quality 
  of 
  the 
  stand. 
  The 
  strips 
  were 
  so 
  run 
  through 
  all 
  types 
  of 
  

   forest 
  as 
  to 
  afford 
  a 
  basis 
  for 
  a 
  close 
  estimate 
  of 
  the 
  stand. 
  These 
  

   '"valuation 
  surveys" 
  covered 
  1,900 
  acres, 
  or 
  about 
  2 
  per 
  cent 
  of 
  the 
  

   total 
  forest 
  area. 
  

  

  The 
  table 
  giving 
  the 
  merchantable 
  contents 
  of 
  pine 
  in 
  board 
  feet 
  was 
  

   constructed 
  by 
  scaling 
  the 
  logs 
  of 
  625 
  felled 
  trees. 
  The 
  rate 
  of 
  growth 
  

  

  3 
  

  

  