﻿4:62 
  Mutations 
  

  

  aspect 
  of 
  the 
  subject, 
  including 
  the 
  general 
  pedi- 
  

   gree 
  of 
  the 
  animal 
  and 
  vegetable 
  kingdom, 
  may 
  

   be 
  said 
  to 
  have 
  been 
  outlined 
  by 
  Darwin 
  and 
  his 
  

   followers, 
  but 
  this 
  phase 
  of 
  the 
  subject 
  lies 
  be- 
  

   yond 
  the 
  limits 
  of 
  our 
  present 
  discussion. 
  

  

  The 
  other 
  phase 
  of 
  the 
  problem 
  is 
  concerned 
  

   with 
  the 
  manner 
  in 
  which 
  the 
  single 
  elementary 
  

   species 
  and 
  varieties 
  have 
  sprung 
  from 
  one 
  an- 
  

   other. 
  There 
  is 
  no 
  reason 
  to 
  suppose 
  that 
  the 
  

   world 
  is 
  reaching 
  the 
  end 
  of 
  its 
  development, 
  

   and 
  so 
  we 
  are 
  to 
  infer 
  that 
  the 
  production 
  of 
  

   new 
  species 
  and 
  varieties 
  is 
  still 
  going 
  on. 
  In 
  

   reality, 
  new 
  forms 
  are 
  observed 
  to 
  originate 
  

   from 
  time 
  to 
  time, 
  both 
  wild 
  and 
  in 
  cultivation, 
  

   and 
  such 
  facts 
  do 
  not 
  leave 
  any 
  doubt 
  as 
  to 
  their 
  

   origin 
  from 
  other 
  allied 
  types, 
  and 
  according 
  to 
  

   natural 
  and 
  general 
  laws. 
  

  

  In 
  the 
  wild 
  state 
  however, 
  and 
  even 
  with 
  cul- 
  

   tivated 
  plants 
  of 
  the 
  field 
  and 
  garden, 
  the 
  condi- 
  

   tions, 
  though 
  allowing 
  of 
  the 
  immediate 
  obser- 
  

   vation 
  of 
  the 
  origination 
  of 
  new 
  forms, 
  are 
  by 
  no 
  

   means 
  favorable 
  for 
  a 
  closer 
  inquiry 
  into 
  the 
  

   real 
  nature 
  of 
  the 
  process. 
  Therefore 
  I 
  shall 
  

   postpone 
  the 
  discussion 
  of 
  the 
  facts 
  till 
  an- 
  

   other 
  lecture, 
  as 
  their 
  bearing 
  will 
  be 
  more 
  

   easily 
  understood 
  after 
  having 
  dealt 
  with 
  more 
  

   complete 
  cases. 
  

  

  These 
  can 
  only 
  be 
  obtained 
  by 
  direct 
  experi- 
  

   mentation. 
  Comparative 
  studies, 
  of 
  course, 
  

  

  