﻿122 
  

  

  INTRODUCTION 
  TO 
  BOTANY 
  

  

  means 
  of 
  roads 
  helps 
  to 
  keep 
  small 
  fires 
  from 
  spreading, 
  but 
  

   in 
  warm 
  dry 
  weather 
  a 
  coniferous-forest 
  fire 
  under 
  full 
  head- 
  

   way 
  makes 
  such 
  leaps 
  that 
  it 
  is 
  seldom 
  stopped 
  until 
  it 
  reaches 
  

   extensive 
  clearings 
  or 
  rivers 
  or 
  other 
  large 
  bodies 
  of 
  water. 
  

  

  Fio. 
  99. 
  Oak 
  trees 
  growing 
  in 
  the 
  open 
  

   White 
  oak 
  ;it 
  the 
  left 
  and 
  ivd 
  oak 
  at 
  the 
  right 
  

  

  5. 
  Parasitic 
  fungi 
  and 
  the 
  saprophytic 
  kinds 
  which 
  cause 
  the 
  

   decay 
  of 
  fallen 
  trunks 
  and 
  branches 
  or 
  felled 
  trees 
  (figs. 
  Isj 
  

   and 
  199) 
  should 
  be 
  burned, 
  when 
  this 
  is 
  not 
  too 
  expensive 
  and 
  

   when 
  it 
  can 
  be 
  managed 
  without 
  danger 
  of 
  starting 
  forest 
  fires. 
  

  

  