﻿Balanced 
  Crosses 
  

  

  293 
  

  

  Cross 
  

  

  Mephisto 
  

  

  1. 
  Generation 
  2. 
  Generation 
  3. 
  Generation 
  

  

  /4- 
  100% 
  Mephisto 
  

  

  Danebrog 
  

  

  '77.5% 
  Dom 
  

  

  All 
  Mephisto{ 
  

  

  9- 
  all 
  hybrids 
  with 
  

   83-68% 
  domi- 
  

   nants 
  and 
  17- 
  

   32% 
  recessives. 
  

  

  22.5% 
  Recess. 
  

  

  100% 
  

   brog. 
  

  

  Dane- 
  

  

  Examining 
  these 
  figures 
  we 
  find 
  one-fourth 
  of 
  

   constant 
  recessives, 
  as 
  has 
  already 
  been 
  said, 
  

   further 
  one-fourth 
  of 
  constant 
  dominants, 
  and 
  

   the 
  rest 
  or 
  one 
  half 
  as 
  unstable 
  hybrids. 
  Both 
  

   of 
  the 
  pure 
  groups 
  have 
  therefore 
  reappeared 
  

   in 
  the 
  same 
  numbers. 
  Calling 
  A 
  the 
  specimens 
  

   with 
  the 
  pure 
  active 
  mark, 
  L 
  those 
  with 
  the 
  la- 
  

   tent 
  mark, 
  and 
  H 
  the 
  hybrids, 
  these 
  proportions 
  

   may 
  be 
  expressed 
  as 
  follows: 
  

  

  1A 
  + 
  2H 
  + 
  1L. 
  

  

  This 
  simple 
  law 
  for 
  the 
  constitution 
  of 
  the 
  sec- 
  

   ond 
  generation 
  of 
  varietal 
  hybrids 
  with 
  a 
  single 
  

   differentiating 
  mark 
  in 
  their 
  parents 
  is 
  called 
  

   the 
  law 
  of 
  Mendel. 
  Mendel 
  published 
  it 
  in 
  

   1865, 
  but 
  his 
  paper 
  remained 
  nearly 
  unknown 
  

   to 
  scientific 
  hybridists. 
  It 
  is 
  only 
  of 
  late 
  years 
  

   that 
  it 
  has 
  assumed 
  a 
  high 
  place 
  in 
  scientific 
  

   literature, 
  and 
  attained 
  the 
  first 
  rank 
  as 
  an 
  in- 
  

   vestigation 
  on 
  fundamental 
  questions 
  of 
  hered- 
  

  

  