﻿Origin 
  of 
  Wild 
  Species 
  577 
  

  

  It 
  is 
  manifest 
  that 
  we 
  must 
  be 
  very 
  careful 
  and 
  

   conservative 
  in 
  dealing 
  with 
  new 
  facts 
  that 
  are 
  

   brought 
  to 
  our 
  attention, 
  and 
  every 
  effort 
  should 
  

   be 
  made 
  to 
  bring 
  additional 
  evidence 
  to 
  light. 
  

   Many 
  vegetable 
  anomalies 
  are 
  so 
  rare 
  that 
  

   they 
  are 
  met 
  with 
  only 
  by 
  the 
  purest 
  

   chance, 
  and 
  are 
  then 
  believed 
  to 
  be 
  wholly 
  

   new. 
  When 
  a 
  white 
  variety 
  of 
  some 
  common 
  

   plant 
  is 
  met 
  with 
  for 
  the 
  first 
  time 
  we 
  generally 
  

   assume 
  that 
  it 
  originated 
  on 
  that 
  very 
  spot 
  

   and 
  only 
  a 
  short 
  time 
  previously. 
  The 
  discov- 
  

   ery 
  of 
  a 
  second 
  locality 
  for 
  the 
  same 
  variety 
  at 
  

   once 
  raises 
  the 
  question 
  as 
  to 
  a 
  common 
  origin 
  

   in 
  the 
  two 
  instances. 
  Could 
  not 
  the 
  plants 
  of 
  

   the 
  second 
  locality 
  have 
  arisen 
  from 
  seeds 
  

   transported 
  from 
  the 
  first? 
  

  

  White 
  varieties 
  of 
  many 
  species 
  of 
  blue-bells 
  

   and 
  gentians 
  are 
  found 
  not 
  rarely, 
  white-flower- 
  

   ing 
  plants 
  of 
  heather, 
  both 
  of 
  Erica 
  Tetralix 
  and 
  

   Calluna 
  vulgaris 
  occur 
  on 
  European 
  heaths; 
  

   white 
  flowers 
  of 
  Brunella 
  vulgaris, 
  Ononis 
  re- 
  

   pens, 
  Thymus 
  vulgaris 
  and 
  others 
  may 
  be 
  seen 
  

   in 
  many 
  localities 
  in 
  the 
  habitats 
  of 
  the 
  colored 
  

   species. 
  Pelories 
  of 
  labiates 
  seem 
  to 
  occur 
  

   often 
  in 
  Austria, 
  but 
  are 
  rare 
  in 
  Holland 
  ; 
  white 
  

   bilberries 
  (Vaccinium 
  Myrtillus) 
  have 
  many 
  

   known 
  localities 
  throughout 
  Europe, 
  and 
  nearly 
  

   all 
  the 
  berry-bearing 
  species 
  in 
  the 
  large 
  heath- 
  

   family 
  are 
  recorded 
  as 
  having 
  white 
  varieties. 
  

  

  