﻿Experimental 
  Pedig 
  fee-Cultures 
  551 
  

  

  served 
  that 
  the 
  attributes 
  of 
  lata 
  and 
  nanella, 
  

   which 
  I 
  now 
  studied 
  in 
  the 
  offspring 
  of 
  iny 
  first 
  

   mutants, 
  were 
  clearly 
  discernible 
  in 
  extreme 
  

   youth,. 
  while 
  those 
  of 
  rubrinervis 
  remained 
  con- 
  

   cealed 
  some 
  weeks 
  longer. 
  Hence 
  I 
  con- 
  

   cluded 
  that 
  the 
  young 
  plants 
  should 
  be 
  examined 
  

   from 
  time 
  to 
  time 
  until 
  they 
  proved 
  clearly 
  to 
  be 
  

   only 
  normal 
  lamarcUiana. 
  Individuals 
  ex- 
  

   hibiting 
  any 
  deviation 
  from 
  the 
  type, 
  or 
  even 
  

   giving 
  only 
  a 
  slight 
  indication 
  of 
  it, 
  were 
  forth- 
  

   with 
  taken 
  out 
  of 
  the 
  beds 
  and 
  planted 
  separate- 
  

   ly, 
  under 
  circumstances 
  as 
  favorable 
  as 
  possible. 
  

   They 
  were 
  established 
  in 
  pots 
  with 
  well-manured 
  

   soil 
  and 
  kept 
  under 
  glass, 
  but 
  fully 
  exposed 
  to 
  

   sunshine. 
  As 
  a 
  rule 
  they 
  grew 
  very 
  fast, 
  and 
  

   could 
  be 
  planted 
  out 
  early 
  in 
  June. 
  Some 
  of 
  

   them, 
  of 
  course, 
  proved 
  to 
  have 
  been 
  erroneous- 
  

   ly 
  taken 
  for 
  mutants, 
  but 
  many 
  exhibited 
  new 
  

   characters. 
  

  

  All 
  in 
  all 
  I 
  had 
  334 
  young 
  plants 
  which 
  did 
  

   not 
  agree 
  with 
  the 
  parental 
  type. 
  As 
  I 
  exam- 
  

   ined 
  some 
  14000 
  seedlings 
  altogether, 
  the 
  result 
  

   was 
  estimated 
  at 
  about 
  2.5#. 
  This 
  proportion 
  

   is 
  much 
  larger 
  than 
  in 
  the 
  yields 
  of 
  the 
  two 
  first 
  

   generations 
  and 
  illustrates 
  the 
  value 
  of 
  im- 
  

   proved 
  methods. 
  No 
  doubt 
  many 
  good 
  muta- 
  

   tions 
  had 
  been 
  overlooked 
  in 
  the 
  earlier 
  observa- 
  

   tions. 
  

  

  As 
  was 
  to 
  be 
  expected, 
  lata 
  and 
  nanella 
  

  

  