﻿Mutations 
  in 
  Horticulture 
  613 
  

  

  thought 
  to 
  be 
  lost, 
  and 
  the 
  culture 
  was 
  given 
  up, 
  

   as 
  the 
  Mendelian 
  law 
  of 
  the 
  splitting 
  of 
  varietal 
  

   hybrids 
  was 
  not 
  known. 
  According 
  to 
  our 
  pres- 
  

   ent 
  knowledge 
  we 
  might 
  expect 
  the 
  atavistic 
  de- 
  

   scendants 
  of 
  the 
  first 
  dwarf 
  to 
  be 
  hybrids, 
  and 
  

   to 
  be 
  liable 
  to 
  split 
  in 
  their 
  progeny 
  into 
  one- 
  

   fourth 
  dwarfs 
  and 
  three-fourths 
  normal 
  speci- 
  

   mens. 
  From 
  this 
  it 
  is 
  obvious 
  that 
  the 
  dwarfs 
  

   would 
  have 
  appeared 
  a 
  second 
  time 
  if 
  the 
  strain 
  

   had 
  been 
  continued 
  by 
  means 
  of 
  the 
  seeds 
  of 
  the 
  

   vicinistic 
  progeny. 
  

  

  In 
  order 
  to 
  avoid 
  a 
  return 
  to 
  this 
  phase 
  of 
  the 
  

   question, 
  another 
  use 
  of 
  the 
  vicinists 
  should 
  at 
  

   once 
  be 
  pointed 
  out. 
  It 
  is 
  the 
  possibility 
  of 
  in- 
  

   creasing 
  the 
  yield 
  of 
  the 
  new 
  variety. 
  If 
  space 
  

   admits 
  of 
  sowing 
  the 
  seeds 
  of 
  the 
  vicinists, 
  a 
  

   quarter 
  of 
  the 
  progeny 
  may 
  be 
  expected 
  to 
  come 
  

   true 
  to 
  the 
  new 
  type, 
  and 
  if 
  they 
  were 
  partly 
  

   pollinated 
  by 
  the 
  dwarfs, 
  even 
  a 
  larger 
  number 
  

   would 
  do 
  so. 
  Hence 
  it 
  should 
  be 
  made 
  a 
  rule 
  to 
  

   sow 
  these 
  seeds 
  also, 
  at 
  least 
  when 
  those 
  of 
  the 
  

   true 
  representatives 
  of 
  the 
  novelty 
  do 
  not 
  give 
  

   seed 
  enough 
  for 
  a 
  rapid 
  multiplication. 
  

  

  Other 
  dwarfs 
  are 
  recorded 
  to 
  have 
  sprung 
  

   from 
  species 
  in 
  the 
  same 
  sudden 
  and 
  unexpected 
  

   manner, 
  as 
  for 
  instance 
  Ageratum 
  coeruleum 
  of 
  

   the 
  same 
  nursery, 
  further 
  Clematis 
  Viticella 
  

   nana 
  and 
  Acer 
  campestre 
  nanum. 
  Prunus 
  Ma- 
  

   haleb 
  nana 
  was 
  discovered 
  in 
  1828 
  in 
  one 
  

  

  