﻿Systematic 
  Atavism 
  657 
  

  

  these 
  plants, 
  but 
  the 
  following 
  year 
  the 
  

   " 
  Acme 
  " 
  was 
  sown 
  again 
  and 
  found 
  true 
  to 
  its 
  

   type. 
  Seeds 
  saved 
  from 
  this 
  generation 
  in 
  1900 
  

   have, 
  however, 
  repeated 
  the 
  mutation, 
  giving 
  

   rise 
  to 
  exactly 
  the 
  same 
  new 
  upright 
  form 
  in 
  

   1901. 
  This 
  was 
  called 
  by 
  its 
  originator 
  " 
  The 
  

   Washington.' 
  7 
  Seeds 
  from 
  this 
  second 
  muta- 
  

   tion 
  were 
  kindly 
  sent 
  to 
  me 
  by 
  Mr. 
  White, 
  and 
  

   proved 
  true 
  to 
  their 
  type 
  when 
  sown 
  in 
  my 
  

   garden. 
  

  

  Obviously 
  it 
  is 
  to 
  be 
  assumed 
  in 
  the 
  case 
  of 
  

   the 
  tomatoes 
  as 
  well 
  as 
  in 
  instances 
  from 
  

   other 
  genera 
  cited, 
  that 
  characters 
  of 
  an- 
  

   cestors, 
  which 
  are 
  not 
  displayed 
  in 
  their 
  

   progeny, 
  have 
  not 
  been 
  entirely 
  lost, 
  but 
  are 
  still 
  

   present, 
  though 
  in 
  a 
  latent 
  condition. 
  They 
  

   may 
  resume 
  their 
  activity 
  unexpectedly, 
  and 
  at 
  

   once 
  develop 
  all 
  the 
  features 
  which 
  they 
  for- 
  

   merly 
  had 
  borne. 
  

  

  Latency, 
  from 
  this 
  point 
  of 
  view, 
  must 
  be 
  one 
  

   of 
  the 
  most 
  common 
  things 
  in 
  nature. 
  All 
  or- 
  

   ganisms 
  are 
  to 
  be 
  considered 
  as 
  internally 
  

   formed 
  of 
  a 
  host 
  of 
  units, 
  partly 
  active 
  and 
  

   partly 
  inactive. 
  Extremely 
  minute 
  and 
  almost 
  

   inconceivably 
  numerous, 
  these 
  units 
  must 
  have 
  

   their 
  material 
  representatives 
  within 
  the 
  most 
  

   intimate 
  parts 
  of 
  the 
  cells. 
  

  

  