﻿178 
  Retrograde 
  Varieties 
  

  

  descent 
  is 
  a 
  requisite. 
  By 
  so 
  doing, 
  we 
  exclude 
  

   most 
  of 
  the 
  facts 
  which 
  were 
  until 
  now 
  gener- 
  

   ally 
  relied 
  upon. 
  For 
  the 
  roses, 
  the 
  hyacinths, 
  

   the 
  tulips, 
  the 
  chrysanthemums 
  always 
  have 
  

   furnished 
  the 
  largest 
  contributions 
  to 
  the 
  dem- 
  

   onstrations 
  of 
  bud-variation. 
  But 
  they 
  have 
  

   been 
  crossed 
  so 
  often, 
  that 
  doubt 
  as 
  to 
  the 
  purity 
  

   of 
  the 
  descent 
  of 
  any 
  single 
  form 
  may 
  recur, 
  

   and 
  may 
  destroy 
  the 
  usefulness 
  of 
  their 
  many 
  

   recorded 
  cases 
  of 
  bud-variation 
  for 
  the 
  demon- 
  

   stration 
  of 
  real 
  atavism. 
  The 
  same 
  assertion 
  

   holds 
  good 
  in 
  many 
  other 
  cases, 
  as 
  with 
  Azalea 
  

   and 
  Camellia. 
  And 
  the 
  striped 
  varieties 
  of 
  

   these 
  genera 
  belong 
  to 
  the 
  group 
  of 
  ever-sport- 
  

   ing 
  forms, 
  and 
  therefore 
  will 
  be 
  considered 
  

   later 
  on. 
  So 
  it 
  is 
  with 
  carnations 
  and 
  

   pinks, 
  which 
  occasionally 
  vary 
  by 
  layering, 
  and 
  

   of 
  which 
  some 
  kinds 
  are 
  so 
  uncertain 
  in 
  char- 
  

   acter 
  that 
  they 
  are 
  called 
  by 
  floriculturists 
  

   " 
  catch-flowers." 
  On 
  the 
  other 
  hand 
  there 
  is 
  

   a 
  larger 
  group 
  of 
  cases 
  of 
  reversion 
  by 
  buds, 
  

   which 
  is 
  probably 
  not 
  of 
  hybrid 
  nature, 
  nor 
  due 
  

   to 
  innate 
  inconstancy 
  of 
  the 
  variety, 
  but 
  must 
  

   be 
  considered 
  as 
  pure 
  atavism. 
  I 
  refer 
  to 
  the 
  

   bud-variations 
  of 
  so 
  many 
  of 
  our 
  cultivated 
  

   varieties 
  of 
  shrubs 
  and 
  trees. 
  Many 
  of 
  them 
  

   are 
  cultivated 
  because 
  of 
  their 
  foliage. 
  They 
  

   are 
  propagated 
  by 
  grafting, 
  and 
  in 
  most 
  cases 
  

   it 
  is 
  probable 
  that 
  all 
  the 
  numerous 
  specimens 
  

  

  