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  from 
  other 
  trees. 
  I 
  had 
  one 
  pignut 
  tree 
  (H. 
  Glabra) 
  full 
  of 
  

   female 
  flowers 
  which 
  contained 
  only 
  one 
  male 
  flower, 
  so 
  far 
  

   as 
  I 
  could 
  discover 
  and 
  which 
  I 
  removed. 
  On 
  one 
  side 
  of 
  this 
  

   tree 
  was 
  a 
  bitternut; 
  on 
  the 
  other 
  side 
  a 
  shagbark. 
  This 
  tree 
  

   bore 
  a 
  full 
  crop 
  of 
  pignuts, 
  (Hicoria 
  glabra) 
  evidently 
  poUinized 
  

   on 
  one 
  side 
  by 
  the 
  bitternut 
  and 
  on 
  the 
  other 
  side 
  by 
  the 
  shag- 
  

   bark 
  These 
  points 
  are 
  made 
  for 
  the 
  purpose 
  of 
  showing 
  the 
  

   necessity 
  of 
  covering 
  the 
  female 
  flowers 
  with 
  bags 
  in 
  our 
  nut 
  

   tree 
  hybridizations. 
  We 
  must 
  sprinkle 
  Persian 
  insect 
  powder 
  

   inside 
  the 
  bags 
  or 
  insects 
  will 
  increase 
  under 
  protection. 
  When 
  

   we 
  have 
  placed 
  bags 
  over 
  female 
  flowers, 
  it 
  is 
  necessary 
  to 
  mark 
  

   the 
  limb; 
  otherwise, 
  other 
  nuts 
  borne 
  on 
  neighboring 
  limbs 
  will 
  

   be 
  mistaken 
  for 
  the 
  hybridized 
  nuts 
  unless 
  we 
  carefully 
  place 
  a 
  

   mark 
  about 
  the 
  limb. 
  Copper 
  wire 
  twisted 
  loosely 
  is, 
  I 
  find, 
  

   the 
  best. 
  Copper 
  wire 
  carrying 
  a 
  copper 
  tag 
  with 
  the 
  names 
  

   of 
  the 
  trees 
  which 
  are 
  crossed 
  is 
  best. 
  If 
  I 
  mark 
  the 
  limb 
  with 
  

   string 
  or 
  with 
  strong 
  cord 
  I 
  find 
  there 
  are 
  many 
  ways 
  for 
  its 
  

   disappearance. 
  Early 
  in 
  the 
  spring 
  the 
  birds 
  like 
  it 
  so 
  well 
  

   that 
  they 
  will 
  untie 
  square 
  knots 
  in 
  order 
  to 
  put 
  it 
  into 
  their 
  

   nests. 
  Later 
  in 
  the 
  season 
  the 
  squirrels 
  will 
  bite 
  off 
  these 
  marks 
  

   made 
  with 
  cords 
  for 
  no 
  other 
  purpose, 
  so 
  far 
  as 
  I 
  know, 
  except 
  

   satisfying 
  a 
  love 
  of 
  mischief. 
  Now 
  I 
  am 
  not 
  psychologist 
  enough 
  

   to 
  state 
  that 
  this 
  is 
  the 
  reason 
  for 
  the 
  action 
  of 
  the 
  red 
  squirrel, 
  

   and 
  can 
  only 
  remember 
  that 
  when 
  I 
  was 
  a 
  boy 
  I 
  used 
  to 
  do 
  

   things 
  that 
  the 
  red 
  squirrel 
  now 
  does. 
  (Laughter.) 
  Conse- 
  

   quently, 
  on 
  that 
  basis, 
  I 
  traced 
  the 
  psychology 
  back 
  to 
  plain 
  

   pure 
  mischief. 
  Red 
  squirrels 
  and 
  white 
  footed 
  mice 
  must 
  be 
  

   looked 
  after 
  with 
  great 
  care 
  in 
  our 
  hybridized 
  trees. 
  If 
  the 
  

   squirrels 
  cannot 
  get 
  at 
  a 
  nut 
  that 
  is 
  surrounded 
  by 
  wire 
  cloth, 
  

   they 
  will 
  cut 
  off 
  the 
  branch 
  and 
  allow 
  it 
  to 
  fall 
  to 
  the 
  ground 
  

   and 
  then 
  manage 
  to 
  get 
  it 
  out. 
  White 
  footed 
  mice 
  will 
  make 
  

   their 
  way 
  through 
  wire, 
  and 
  mice 
  and 
  squirrels 
  will 
  both 
  manage 
  

   to 
  bite 
  through 
  wire 
  cloth 
  unless 
  it 
  is 
  very 
  strong 
  in 
  order 
  to 
  

   get 
  at 
  the 
  nut. 
  The 
  mere 
  fact 
  of 
  nuts 
  being 
  protected 
  by 
  wire 
  

   cloth 
  or 
  in 
  other 
  ways 
  seems 
  to 
  attract 
  the 
  attention 
  of 
  squir- 
  

   rels. 
  One 
  of 
  my 
  men, 
  a 
  Russian, 
  said, 
  in 
  rather 
  broken 
  English, 
  

   "Me 
  try 
  remember 
  which 
  nuts 
  pollinized; 
  no 
  put 
  on 
  wire, 
  no 
  

   put 
  on 
  tag, 
  no 
  put 
  on 
  nothing; 
  squirrel 
  see 
  that, 
  see 
  right 
  straight, 
  

   bite 
  off 
  one 
  where 
  you 
  put 
  sign 
  for 
  him." 
  (Laughter.) 
  The 
  

   best 
  way 
  for 
  keeping 
  squirrels 
  and 
  white 
  footed 
  mice 
  from 
  as- 
  

   cending 
  a 
  tree, 
  I 
  find 
  is 
  by 
  tacking 
  common 
  tin, 
  slippery 
  smooth 
  

   tin, 
  around 
  the 
  trunk 
  of 
  the 
  tree 
  and 
  this 
  may 
  be 
  left 
  on 
  only 
  

  

  