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  INTRODUCTION 
  TO 
  BOTANY 
  

  

  portions 
  of 
  this 
  country 
  the 
  farmers 
  collect 
  and 
  carry 
  inland 
  

   great 
  quantities 
  of 
  brown 
  alga- 
  and 
  spread 
  them 
  over 
  the 
  

   cultivated 
  land 
  as 
  a 
  fertilizer. 
  1 
  

  

  *><> 
  

  

  FIG. 
  181. 
  A 
  red 
  alga 
  (Dasya) 
  

  

  219. 
  The 
  red 
  algae. 
  The 
  red 
  alg;e 
  grow 
  mostly 
  in 
  deeper 
  

   water 
  than 
  do 
  the 
  brown 
  alg;e. 
  They 
  are 
  almost 
  wholly 
  con- 
  

   fined 
  to 
  salt 
  water. 
  

  

  The 
  marine 
  forms 
  of 
  this 
  group 
  present 
  most 
  striking 
  shapes 
  

   and 
  colors. 
  They 
  are 
  of 
  different 
  shades 
  of 
  red, 
  varying 
  from 
  

   the 
  most 
  brilliant 
  to 
  those 
  that 
  are 
  dark 
  and 
  somber, 
  while 
  

  

  1 
  For 
  the 
  reproduction 
  of 
  the 
  brown 
  and 
  red 
  algae, 
  see 
  Bergen 
  and 
  Davis, 
  

   Principles 
  of 
  Botany. 
  

  

  