﻿Unbalanced 
  Crosses 
  275 
  

  

  psittacinus 
  and 
  G. 
  cardinalis, 
  and 
  between 
  their 
  

   hybrid, 
  which 
  is 
  still 
  known 
  under 
  the 
  name 
  of 
  

   gandavensis 
  and 
  the 
  purpureo-auratus. 
  But 
  

   other 
  authors 
  give 
  other 
  lines 
  of 
  descent. 
  So 
  

   it 
  is 
  with 
  Amaryllis 
  , 
  which 
  is 
  said 
  by 
  De 
  Graaff 
  

   to 
  owe 
  its 
  stripes 
  to 
  A. 
  vittata, 
  its 
  fine 
  form 
  to 
  

   A. 
  brasiliensis, 
  the 
  large 
  petals 
  to 
  A. 
  psittacina, 
  

   the 
  giant 
  flowers 
  to 
  A. 
  leopoldi, 
  and 
  the 
  piebald 
  

   patterns 
  to 
  A. 
  pardina. 
  But 
  here, 
  too, 
  other 
  

   authors 
  give 
  other 
  derivations. 
  

  

  Summarizing 
  the 
  results 
  of 
  our 
  inquiry 
  we 
  

   see 
  in 
  the 
  first 
  place 
  how 
  very 
  much 
  remains 
  to 
  

   be 
  done. 
  Many 
  old 
  crosses 
  must 
  be 
  repeated 
  

   and 
  studied 
  anew, 
  taking 
  care 
  of 
  the 
  purity 
  of 
  

   the 
  cross 
  as 
  well 
  as 
  of 
  the 
  harvesting 
  of 
  the 
  

   seeds. 
  Many 
  supposed 
  facts 
  will 
  be 
  shown 
  to 
  

   be 
  of 
  doubtful 
  validity. 
  New 
  facts 
  have 
  to 
  be 
  

   gathered, 
  and 
  in 
  doing 
  so 
  the 
  distinction 
  be- 
  

   tween 
  specific 
  and 
  varietal 
  marks 
  must 
  be 
  taken 
  

   strictly 
  into 
  account. 
  The 
  first 
  have 
  originated 
  

   as 
  progressive 
  mutations 
  ; 
  they 
  give 
  unbalanced 
  

   crosses 
  with 
  a 
  constant 
  offspring, 
  as 
  far 
  as 
  ex- 
  

   perience 
  now 
  goes. 
  The 
  second 
  are 
  chiefly 
  due 
  

   to 
  retrograde 
  modifications, 
  and 
  will 
  be 
  the 
  sub- 
  

   ject 
  of 
  the 
  next 
  lecture. 
  

  

  