﻿AND 
  STARCH 
  CHARACTERS 
  IN 
  CORN 
  141 
  

  

  kernels 
  as 
  I 
  have 
  found 
  them. 
  Both 
  these 
  figures 
  are 
  from 
  kernels 
  

   of 
  his 
  pure 
  race 
  {R. 
  dulcis). 
  Correns 
  does 
  not 
  give 
  figures 
  of 
  any 
  

   of 
  his 
  Fi 
  kernels, 
  which 
  he 
  describes 
  as 
  "almost 
  smooth," 
  but 
  ap- 
  

   parently 
  regards 
  them 
  as 
  like 
  those 
  figured 
  from 
  the 
  pure 
  race. 
  

   He 
  describes 
  the 
  F2 
  generations 
  from 
  only 
  three 
  of 
  his 
  sweet 
  flint 
  

   and 
  pop 
  crosses 
  making 
  the 
  general 
  statement 
  that 
  those 
  described 
  

   are 
  typical 
  of 
  the 
  whole 
  series. 
  In 
  the 
  first 
  of 
  these 
  three, 
  Exp. 
  

   107, 
  {R. 
  rubra 
  X 
  R. 
  d^dcis) 
  X 
  R. 
  dulcis 
  (back 
  cross 
  by 
  recessive 
  

   on 
  Fi), 
  out 
  of 
  140 
  kernels 
  he 
  obtained 
  50 
  per 
  cent 
  wrinkled 
  kernels, 
  

   5.8 
  p^ 
  cent 
  intermediate 
  kernels, 
  44.3 
  per 
  cent 
  smooth 
  kernels, 
  

   the 
  Fi 
  generation 
  having 
  given 
  only 
  smooth 
  kernels. 
  

  

  The 
  F3 
  generation, 
  Exp. 
  108, 
  {R. 
  rubra 
  X 
  R. 
  didcis) 
  X 
  R- 
  

   didcis, 
  in 
  which 
  the 
  wrinkled 
  kernels 
  of 
  the 
  F2 
  were 
  grown 
  and 
  

   pollinated 
  by 
  the 
  original 
  sugar 
  parent 
  (back 
  cross 
  on 
  extracted 
  

   recessive) 
  gave 
  three 
  ears, 
  two 
  of 
  which 
  were 
  all 
  wrinkled, 
  but 
  in 
  

   the 
  third 
  about 
  one 
  seventh 
  of 
  the 
  kernels 
  were 
  "only 
  slightly 
  

   wrinkled." 
  The 
  parallel 
  F3 
  generation, 
  Exp. 
  109, 
  in 
  which 
  

   the 
  smooth 
  kernels 
  of 
  the 
  F2 
  were 
  grown 
  and 
  pollinated 
  by 
  the 
  

   original 
  R. 
  dulcis 
  gave 
  one 
  large 
  and 
  two 
  poor 
  ears 
  on 
  one 
  plant. 
  

   Correns 
  reports 
  the 
  kernels 
  as 
  "about 
  half 
  smooth 
  and 
  half 
  

   wrinkled, 
  some 
  only 
  slightly." 
  He 
  reports 
  counting 
  only 
  part 
  of 
  

   the 
  kernels, 
  of 
  which 
  82 
  were 
  wrinkled 
  and 
  2 
  almost 
  smooth, 
  74 
  

   smooth; 
  that 
  is 
  "53.2 
  per 
  cent 
  more 
  or 
  less 
  wrinkled 
  and 
  46-8 
  

   . 
  per 
  cent 
  smooth," 
  the 
  expectation 
  being 
  of 
  course 
  50 
  per 
  cent 
  

  

  wrinkled 
  and 
  50 
  per 
  cent 
  smooth. 
  

  

  Correns's 
  Exp. 
  no 
  is 
  identical 
  with 
  Exp. 
  108. 
  so 
  far 
  as 
  the 
  

   characters 
  sugar 
  and 
  starch 
  are 
  concerned. 
  He 
  considers 
  this 
  

   experiment 
  open 
  to 
  question 
  since 
  of 
  two 
  plants, 
  one 
  gave 
  three 
  

   ears 
  all 
  wrinkled, 
  the 
  other 
  gave 
  one 
  medium-sized 
  and 
  one 
  small 
  

  

  were 
  

  

  tt 
  

  

  rather 
  many 
  only 
  finely 
  wrinkled 
  or 
  almost 
  smooth" 
  but 
  other- 
  

  

  Wise 
  

  

  tvpical 
  

  

  Whether 
  or 
  

  

  not 
  these 
  results 
  are 
  due 
  to 
  an 
  error 
  in 
  records 
  or 
  manipulation 
  

   there 
  is 
  no 
  question 
  that 
  here 
  again 
  the 
  intermediate 
  sweet 
  starch 
  

   kernels 
  appeared 
  whatever 
  their 
  parentage 
  may 
  have 
  been. 
  

  

  Exp. 
  Ill 
  again 
  duplicates 
  Exp. 
  109 
  so 
  far 
  a. 
  the 
  ^characters 
  

  

  sweet 
  

  

  case 
  

  

  the 
  proportions 
  were 
  50.1 
  per 
  cent 
  smooth, 
  49-9 
  1-r 
  cent 
  wrinkled, 
  

  

  