﻿160 
  Retrograde 
  Varieties 
  

  

  Paper 
  bags 
  also 
  may 
  be 
  made 
  use 
  of. 
  They 
  

   are 
  slipped 
  over 
  the 
  flowering 
  branches, 
  and 
  

   bound 
  together 
  around 
  the 
  twigs, 
  thus 
  enclosing 
  

   the 
  flowers. 
  It 
  is 
  necessary 
  to 
  use 
  prepared 
  

   papers, 
  in 
  order 
  that 
  they 
  may 
  resist 
  rain 
  

   and 
  wind. 
  The 
  best 
  sort, 
  and 
  the 
  one 
  that 
  I 
  

   use 
  almost 
  exclusively 
  in 
  my 
  fertilization-ex- 
  

   periments, 
  is 
  made 
  of 
  parchment-paper. 
  This 
  

   is 
  a 
  wood-pulp 
  preparation, 
  freed 
  artificially 
  

   from 
  the 
  so-called 
  wood-substance 
  or 
  lignin. 
  

   Having 
  covered 
  the 
  flowers 
  with 
  care, 
  and 
  

   having 
  gathered 
  the 
  seeds 
  free 
  from 
  inter- 
  

   mixtures 
  and 
  if 
  possible 
  separately 
  for 
  each 
  

   single 
  individual, 
  it 
  only 
  remains 
  to 
  sow 
  them 
  

   in 
  quantities 
  that 
  will 
  yield 
  the 
  greatest 
  pos- 
  

   sible 
  number 
  of 
  individuals. 
  Eeversions 
  are 
  

   supposed 
  to 
  be 
  rare 
  and 
  small 
  groups 
  of 
  seed- 
  

   lings 
  of 
  course 
  would 
  not 
  suffice 
  to 
  bring 
  them 
  

   to 
  light. 
  Only 
  sowings 
  of 
  many 
  hundreds 
  or 
  

   thousands 
  of 
  individuals 
  are 
  decisive. 
  Such 
  

   sowings 
  can 
  be 
  made 
  in 
  one 
  year, 
  or 
  can 
  

   be 
  extended 
  over 
  a 
  series 
  of 
  years 
  and 
  of 
  gen- 
  

   erations. 
  Hildebrand 
  and 
  Hoffman 
  have 
  pre- 
  

   ferred 
  the 
  last 
  method, 
  and 
  so 
  did 
  Hof- 
  

   meister 
  and 
  many 
  others. 
  Hildebrand 
  sowed 
  

   the 
  white 
  hyacinth, 
  and 
  the 
  white 
  varieties 
  of 
  

   the 
  larkspur, 
  the 
  stock 
  and 
  the 
  sweet 
  pea. 
  Hoff- 
  

   man 
  cultivated 
  the 
  white 
  flax 
  and 
  many 
  other 
  

   varieties 
  and 
  Hofmeister 
  extended 
  his 
  sowings 
  

  

  