﻿LETTER 
  OF 
  TRANSMITTAL. 
  

  

  U. 
  S. 
  Department 
  of 
  Agriculture, 
  

  

  Forest 
  Service, 
  

   Washington, 
  D. 
  C, 
  June 
  27, 
  1906. 
  

   Sir: 
  I 
  have 
  the 
  honor 
  to 
  transmit 
  herewith 
  a 
  report 
  entitled 
  

   " 
  Forest 
  Planting 
  on 
  Coal 
  Lands 
  in 
  Western 
  Pennsylvania/' 
  by 
  S. 
  N. 
  

   Spring, 
  Forest 
  Assistant, 
  Forest 
  Service, 
  and 
  to 
  recommend 
  its 
  publi- 
  

   cation 
  as 
  Circular 
  41 
  of 
  the 
  Forest 
  Service. 
  

   Very 
  respectfully, 
  

  

  GlFFORD 
  PlNCHOT, 
  

  

  Forester. 
  

  

  Hon. 
  James 
  Wilson, 
  

  

  Secretary 
  of 
  Agriculture. 
  

  

  CONTENTS. 
  

  

  Page. 
  

  

  History 
  of 
  the 
  original 
  forest 
  5 
  

  

  Coal 
  mining 
  and 
  its 
  effects 
  6 
  

  

  Effect 
  of 
  coke 
  production 
  8 
  

  

  Opportunity 
  for 
  forest 
  planting 
  8 
  

  

  Insects 
  an 
  obstacle 
  to 
  planting 
  10 
  

  

  Injury 
  by 
  a 
  defoliating 
  caterpillar 
  10 
  

  

  Insect 
  damage 
  to 
  the 
  locust 
  11 
  

  

  The 
  Frick 
  planting 
  plan 
  13 
  

  

  The 
  land 
  13 
  

  

  The 
  plan 
  14 
  

  

  General 
  applicability 
  of 
  the 
  Frick 
  plan 
  15 
  

  

  (3) 
  

  

  