﻿566 
  Mutations 
  

  

  feature, 
  the 
  minute 
  differences 
  in 
  nearly 
  all 
  

   points. 
  

  

  V. 
  The 
  same 
  new 
  species 
  are 
  produced 
  in 
  a 
  

   large 
  number 
  of 
  individuals. 
  

  

  This 
  is 
  a 
  very 
  curious 
  fact. 
  It 
  embraces 
  two 
  

   minor 
  points, 
  viz 
  : 
  the 
  multitude 
  of 
  similar 
  mu- 
  

   tants 
  in 
  the 
  same 
  year, 
  and 
  the 
  repetition 
  there- 
  

   of 
  in 
  succeeding 
  generations. 
  Obviously 
  there 
  

   must 
  be 
  some 
  common 
  cause. 
  This 
  cause 
  must 
  

   be 
  assumed 
  to 
  lie 
  dormant 
  in 
  the 
  Lamarckianas 
  

   of 
  my 
  strain, 
  and 
  probably 
  in 
  all 
  of 
  them, 
  as 
  no 
  

   single 
  parent-plant 
  proved 
  ever 
  to 
  be 
  wholly 
  

   destitute 
  of 
  mutability. 
  Furthermore 
  the 
  dif- 
  

   ferent 
  causes 
  for 
  the 
  sundry 
  mutations 
  must 
  lie 
  

   latent 
  together 
  in 
  the 
  same 
  parent-plant. 
  They 
  

   obey 
  the 
  same 
  general 
  laws, 
  become 
  active 
  under 
  

   similar 
  conditions, 
  some 
  of 
  them 
  being 
  more 
  

   easily 
  awakened 
  than 
  others. 
  The 
  germs 
  of 
  the 
  

   oblonga, 
  lata 
  and 
  nanella 
  are 
  especially 
  ir- 
  

   ritable, 
  and 
  are 
  ready 
  to 
  spring 
  into 
  activity 
  at 
  

   the 
  least 
  summons, 
  while 
  those 
  of 
  gig 
  as, 
  rubri- 
  

   nervis 
  and 
  scintillans 
  are 
  far 
  more 
  difficult 
  to 
  

   arouse. 
  

  

  These 
  germs 
  must 
  be 
  assumed 
  to 
  lie 
  dormant 
  

   during 
  many 
  successive 
  generations. 
  This 
  is 
  

   especially 
  evident 
  in 
  the 
  case 
  of 
  lata 
  and 
  nanella, 
  

   which 
  appeared 
  in 
  the 
  first 
  year 
  of 
  the 
  pedigree- 
  

   culture 
  and 
  which 
  since 
  have 
  been 
  repeated 
  

   yearly, 
  and 
  have 
  been 
  seen 
  to 
  arise 
  by 
  mutation 
  

  

  