﻿Multiplication 
  of 
  Extremes 
  763 
  

  

  scription 
  was 
  given 
  by 
  Morren, 
  and 
  though 
  

   more 
  than 
  one 
  varietal 
  name 
  is 
  recorded 
  in 
  his 
  

   paper, 
  it 
  appears 
  from 
  the 
  facts 
  given 
  that 
  even 
  

   at 
  that 
  time 
  only 
  one 
  variety 
  existed. 
  It 
  was 
  

   commonly 
  called 
  Syringa 
  vulgaris 
  azurea 
  

   plena, 
  and 
  seems 
  to 
  have 
  been 
  very 
  rare 
  and 
  

   without 
  real 
  ornamental 
  value. 
  

  

  Lemoine, 
  however, 
  conceived 
  the 
  desirability 
  

   of 
  a 
  combination 
  of 
  the 
  doubling 
  with 
  the 
  bright 
  

   colors 
  and 
  large 
  flower-racemes 
  of 
  other 
  lilacs, 
  

   and 
  performed 
  a 
  series 
  of 
  crosses. 
  The 
  

   " 
  azurea 
  plena 
  : 
  ' 
  has 
  no 
  stamens, 
  and 
  therefore 
  

   must 
  be 
  used 
  in 
  all 
  crosses 
  as 
  the 
  pistil-parent 
  ; 
  

   its 
  ovary 
  is 
  narrowly 
  inclosed 
  in 
  the 
  tube 
  of 
  the 
  

   flower, 
  and 
  difficult 
  to 
  fertilize. 
  On 
  the 
  other 
  

   hand, 
  new 
  crosses 
  could 
  be 
  made 
  every 
  year, 
  

   and 
  the 
  total 
  number 
  of 
  hybrids 
  with 
  differ- 
  

   ent 
  pollen-parents 
  was 
  rapidly 
  increased. 
  

   After 
  five 
  years 
  the 
  hybrids 
  began 
  to 
  flower 
  and 
  

   could 
  be 
  used 
  for 
  new 
  crosses, 
  yielding 
  a 
  series 
  

   of 
  compound 
  hybrids, 
  which 
  however, 
  were 
  not 
  

   kept 
  separate 
  from 
  the 
  products 
  of 
  the 
  first 
  

   crosses. 
  

  

  Gradually 
  the 
  number 
  of 
  the 
  flowering 
  speci- 
  

   mens 
  increased, 
  and 
  the 
  character 
  of 
  doubling 
  

   was 
  observed 
  to 
  be 
  variable 
  to 
  a 
  high 
  degree. 
  

   Sometimes 
  only 
  one 
  supernumerary 
  petal 
  was 
  

   produced, 
  sometimes 
  a 
  whole 
  new 
  typical 
  corolla 
  

   was 
  extruded 
  from 
  within 
  the 
  first. 
  In 
  the 
  same 
  

  

  