﻿Experimental 
  Pedigree-Cultures 
  567 
  

  

  also 
  during 
  the 
  last 
  season 
  (1903). 
  Only 
  gigas 
  

   appeared 
  but 
  once, 
  but 
  then 
  there 
  is 
  every 
  rea- 
  

   son 
  to 
  assume 
  that 
  in 
  larger 
  sowings 
  or 
  by 
  a 
  pro- 
  

   longation 
  of 
  the 
  experiments 
  it 
  might 
  have 
  made 
  

   a 
  second 
  appearance. 
  

  

  Is 
  the 
  number 
  of 
  such 
  germs 
  to 
  be 
  supposed 
  

   to 
  be 
  limited 
  or 
  unlimited 
  ? 
  My 
  experiment 
  has 
  

   produced 
  about 
  a 
  dozen 
  new 
  forms. 
  Without 
  

   doubt 
  I 
  could 
  easily 
  have 
  succeeded 
  in 
  getting 
  

   more, 
  if 
  I 
  had 
  had 
  any 
  definite 
  reason 
  to 
  search 
  

   for 
  them. 
  But 
  such 
  figures 
  are 
  far 
  from 
  favor- 
  

   ing 
  the 
  assumption 
  of 
  indefinite 
  mutability. 
  

   The 
  group 
  of 
  possible 
  new 
  forms 
  is 
  no 
  doubt 
  

   sharply 
  circumscribed. 
  Partly 
  so 
  by 
  the 
  mor- 
  

   phologic 
  peculiarities 
  of 
  lamarckiana, 
  which 
  

   seem 
  to 
  exclude 
  red 
  flowers, 
  composite 
  leaves, 
  

   etc. 
  No 
  doubt 
  there 
  are 
  more 
  direct 
  rea- 
  

   sons 
  for 
  these 
  limits, 
  some 
  changes 
  having 
  taken 
  

   place 
  initially 
  and 
  others 
  later, 
  while 
  the 
  present 
  

   mutations 
  are 
  only 
  repetitions 
  of 
  previous 
  ones, 
  

   and 
  do 
  not 
  contribute 
  new 
  lines 
  of 
  development 
  

   to 
  those 
  already 
  existing. 
  This 
  leads 
  us 
  to 
  the 
  

   supposition 
  of 
  some 
  common 
  original 
  cause, 
  

   which 
  produced 
  a 
  number 
  of 
  changes, 
  but 
  which 
  

   itself 
  is 
  no 
  longer 
  at 
  work, 
  but 
  has 
  left 
  the 
  af- 
  

   fected 
  qualities, 
  and 
  only 
  these, 
  in 
  the 
  state 
  of 
  

   mutability. 
  

  

  In 
  nature, 
  repeated 
  mutations 
  must 
  be 
  of 
  far 
  

   greater 
  significance 
  than 
  isolated 
  ones. 
  How 
  

  

  