﻿Monstrosities 
  419 
  

  

  ference 
  often 
  indicates 
  what 
  may 
  be 
  expected 
  

   from 
  further 
  culture. 
  Stray 
  tricotyls 
  point 
  to 
  

   poor 
  or 
  half-races, 
  while 
  more 
  frequent 
  devia- 
  

   tions 
  suggest 
  rich 
  or 
  double-races. 
  In 
  both 
  

   cases 
  however, 
  the 
  trial 
  must 
  be 
  made, 
  and 
  this 
  

   requires 
  the 
  isolation 
  of 
  the 
  aberrant 
  individ- 
  

   uals 
  and 
  the 
  determination 
  of 
  their 
  hereditary 
  

   percentage. 
  

  

  In 
  some 
  instances 
  the 
  degree 
  of 
  their 
  in- 
  

   heritance 
  is 
  only 
  a 
  very 
  small 
  one. 
  The 
  iso- 
  

   lated 
  tricotyls 
  yield 
  1 
  or 
  2$ 
  of 
  inheritors, 
  in 
  some 
  

   cases 
  even 
  less, 
  or 
  upwards 
  to 
  3 
  or 
  4#. 
  If 
  the 
  

   experiment 
  is 
  repeated, 
  no 
  amelioration 
  is 
  ob- 
  

   served, 
  and 
  this 
  result 
  remains 
  the 
  same 
  during 
  

   a 
  series 
  of 
  successive 
  generations. 
  In 
  the 
  case 
  

   of 
  Polygonum 
  Convolvulus, 
  the 
  black 
  bindweed, 
  

   I 
  have 
  tried 
  as 
  many 
  as 
  six 
  generations 
  without 
  

   ever 
  obtaining 
  more 
  than 
  3$. 
  With 
  other 
  

   species 
  I 
  have 
  limited 
  myself 
  to 
  four 
  successive 
  

   years 
  with 
  the 
  same 
  negative 
  result, 
  as 
  with 
  

   spinage, 
  the 
  Moldavian 
  dragon-head 
  (Dracoce- 
  

   plialum 
  moldavicum), 
  and 
  two 
  species 
  of 
  corn 
  

   catch-fly 
  (Silene 
  conica 
  and 
  S. 
  conoidea). 
  

  

  Such 
  poor 
  races 
  hardly 
  afford 
  a 
  desirable 
  ma- 
  

   terial 
  for 
  further 
  inquiries. 
  Happily 
  the 
  rich 
  

   races, 
  though 
  rare, 
  may 
  be 
  discovered 
  also 
  from 
  

   time 
  to 
  time. 
  They 
  seem 
  to 
  be 
  more 
  common 
  

   among 
  cultivated 
  plants 
  and 
  horticultural 
  as 
  

   well 
  as 
  agricultural 
  species 
  may 
  be 
  used. 
  Hemp 
  

  

  