﻿238 
  

  

  INTRODUCTION 
  TO 
  BOTANY 
  

  

  has 
  become 
  a 
  large, 
  spherical 
  body. 
  Meanwhile 
  the 
  transverse 
  

   wall 
  has 
  extended 
  into 
  t 
  he 
  spherical 
  sporangium, 
  thus 
  produc- 
  

   ing 
  a 
  little 
  column 
  ( 
  the 
  <-ul,i 
  ,/n'lln 
  ), 
  upon 
  which 
  the 
  sporangium 
  

   contents 
  rest. 
  The 
  protoplasm 
  of 
  the 
  sporangium 
  divides 
  into 
  

   many 
  small 
  spores, 
  which, 
  when 
  the 
  sporangium 
  wall 
  breaks, 
  

   are 
  scattered 
  widely 
  into 
  the 
  air. 
  The 
  musty 
  odor 
  which 
  is 
  

  

  detected 
  when 
  we 
  smell 
  

   mold 
  may 
  be 
  due 
  to 
  the 
  

   presence 
  of 
  large 
  num- 
  

   bers 
  of 
  these 
  spores 
  or 
  

   to 
  gases 
  that 
  have 
  been 
  

   produced 
  within 
  the 
  

   nutrient 
  material. 
  

  

  If 
  bread 
  that 
  has 
  not 
  

   been 
  exposed 
  to 
  the 
  

   air 
  is 
  cut 
  in 
  a 
  room 
  in 
  

   which 
  the 
  air 
  is 
  quiet, 
  

   and 
  if 
  one 
  piece 
  is 
  cov- 
  

   ered 
  directly 
  in 
  a 
  glass 
  

   dish, 
  another 
  similarly 
  

   covered 
  after 
  five 
  min- 
  

   ntes' 
  exposure 
  to 
  the 
  

   air 
  of 
  the 
  room, 
  and 
  

   FIG. 
  185. 
  Grape 
  leaf 
  with 
  grape 
  mildew 
  another 
  after 
  five 
  rnin- 
  

  

  A 
  leaf 
  of 
  the 
  grape, 
  upon 
  which 
  may 
  be 
  seen 
  the 
  Utes' 
  exposure 
  Oil 
  the 
  

   white, 
  fluffy 
  patches 
  of 
  -rape 
  mildew. 
  Photograph 
  outside 
  window 
  sill, 
  ail 
  

   by 
  H. 
  II. 
  Whet/rl 
  . 
  f 
  .-, 
  

  

  interesting 
  test 
  ot 
  the 
  

  

  abundance 
  of 
  spores 
  in 
  the 
  atmosphere 
  will 
  be 
  afforded. 
  One 
  

   class 
  of 
  students, 
  in 
  performing 
  this 
  experiment, 
  secured 
  the 
  

   development 
  of 
  mold 
  upon 
  all 
  three 
  pieces 
  of 
  bread, 
  having 
  

   in 
  all 
  five 
  kinds 
  of 
  mold. 
  Another 
  class 
  used 
  sterilized 
  gelatin 
  

   culture 
  material 
  and 
  exposed 
  it 
  to 
  the 
  air 
  of 
  a 
  schoolhouse 
  

   hallway 
  for 
  five 
  minutes, 
  and 
  during 
  the 
  following 
  week 
  there 
  

   grew 
  upon 
  the 
  gelatin 
  eight 
  different 
  kinds 
  of 
  molds 
  and 
  

   bacteria. 
  Juices 
  of 
  fruits, 
  as 
  prunes, 
  are 
  also 
  good 
  nutrient 
  

   materials 
  for 
  experiments 
  in 
  growing 
  molds. 
  

  

  