﻿Periodic 
  Mutations 
  697 
  

  

  others 
  from 
  the 
  northern 
  parts 
  of 
  Norway 
  may 
  

   be 
  cited 
  as 
  examples. 
  

  

  Thus 
  Primula 
  imperialis 
  has 
  been 
  found 
  

   in 
  the 
  Himalayas, 
  and 
  many 
  other 
  plants 
  of 
  the 
  

   high 
  mountains 
  of 
  Java, 
  Ceylon 
  and 
  north- 
  

   ern 
  India 
  are 
  identical 
  forms. 
  Some 
  species 
  

   from 
  the 
  Cameroons 
  and 
  from 
  Abyssinia 
  have 
  

   been 
  found 
  on 
  the 
  mountains 
  of 
  Madagascar. 
  

   Some 
  peculiar 
  Australian 
  types 
  are 
  represented 
  

   on 
  the 
  summit 
  of 
  Kini 
  Balu 
  in 
  Borneo. 
  None 
  of 
  

   these 
  species, 
  of 
  course, 
  are 
  found 
  in 
  the 
  inter- 
  

   vening 
  lowlands, 
  and 
  the 
  only 
  possible 
  explana- 
  

   tion 
  of 
  their 
  identity 
  is 
  the 
  conception 
  of 
  a 
  com- 
  

   mon 
  post-glacial 
  origin, 
  coupled 
  with 
  complete 
  

   stability. 
  This 
  stability 
  is 
  all 
  the 
  more 
  remark- 
  

   able 
  as 
  nearly 
  allied 
  but 
  slightly 
  divergent 
  

   forms 
  have 
  also 
  been 
  reported 
  from 
  almost 
  

   all 
  of 
  these 
  localities. 
  Other 
  evidence 
  is 
  

   obtained 
  by 
  the 
  comparison 
  of 
  ancient 
  plants 
  

   with 
  their 
  living 
  representatives. 
  The 
  re- 
  

   mains 
  in 
  tombs 
  of 
  ancient 
  Egypt 
  have 
  al- 
  

   ways 
  afforded 
  strong 
  support 
  of 
  the 
  views 
  of 
  

   the 
  adherents 
  of 
  the 
  theory 
  of 
  stability, 
  and 
  to 
  

   my 
  mind 
  they 
  still 
  do 
  so. 
  The 
  cereals 
  and 
  fruits 
  

   and 
  even 
  the 
  flowers 
  and 
  leaves 
  in 
  the 
  funeral 
  

   wreaths 
  of 
  Rameses 
  and 
  Amen-Hotep 
  are 
  the 
  

   same 
  that 
  are 
  still 
  now 
  cultivated 
  in 
  Egypt. 
  

   Nearly 
  a 
  hundred 
  or 
  more 
  species 
  have 
  been 
  

   identified. 
  Flowers 
  of 
  Acacia, 
  leaves 
  of 
  Mimu- 
  

  

  