﻿INTRODUCTION 
  TO 
  BOTAXY 
  

  

  marketing 
  coal, 
  or 
  by 
  any 
  kind 
  <f 
  manufacture 
  in 
  which 
  the 
  

   motive 
  power 
  is 
  obtained 
  by 
  tlio 
  aid 
  of 
  coal, 
  oil, 
  or 
  gas 
  used 
  

   as 
  ftn-1 
  --all 
  these 
  people 
  depend 
  upon 
  the 
  products 
  of 
  the 
  

   plant 
  life 
  that 
  was 
  abundant 
  on 
  the 
  earth 
  or 
  in 
  the 
  seas 
  

   during 
  past 
  ages. 
  The 
  air 
  which 
  we 
  breathe 
  is 
  purified 
  partly 
  

   through 
  processes 
  by 
  means 
  of 
  which 
  green 
  plants 
  live. 
  It 
  is 
  

  

  . 
  L 
  

  

  _[* 
  r- 
  1 
  

  

  "*" 
  . 
  * 
  1 
  . 
  ,*.- 
  

  

  Fiu. 
  1. 
  Sparse 
  vegetation 
  as 
  seen 
  upon 
  the 
  sand 
  dunes 
  along 
  the 
  shore 
  

  

  <>f 
  Lake 
  Michigan 
  

  

  The 
  wind-blown 
  sand 
  presents 
  a 
  pour 
  living 
  place 
  for 
  plants, 
  although 
  along 
  the 
  

   upper 
  beach 
  a 
  fringe 
  of 
  trees 
  ami 
  oilier 
  plants 
  lias 
  become 
  established. 
  In 
  the 
  

   View 
  here 
  shown 
  the 
  sand 
  has 
  been 
  blown 
  into 
  delinite 
  ripples 
  reaching 
  dov.n 
  

  

  almost 
  to 
  this 
  \vater 
  of 
  the 
  lake 
  

  

  evident, 
  then, 
  that 
  human 
  life 
  could 
  not 
  continue 
  for 
  a 
  single 
  

   week 
  without 
  the 
  aid 
  of 
  substances 
  produced 
  bv 
  the 
  life 
  and 
  

   growth 
  of 
  plants. 
  

  

  2. 
  Plant 
  production. 
  The 
  domesticated 
  animals 
  that 
  are 
  so 
  

   extensively 
  used 
  to 
  help 
  man 
  in 
  his 
  work, 
  and 
  those 
  that 
  he 
  

   grows 
  for 
  food 
  or 
  for 
  market, 
  could 
  not 
  be 
  cared 
  for 
  if 
  it 
  were 
  

   not 
  possible 
  to 
  have 
  plants 
  or 
  plant 
  products 
  for 
  their 
  food. 
  

  

  