﻿EVIDENCE 
  ON 
  MAN'S 
  EVOLUTION 
  HRDLI(5kA 
  427 
  

  

  and 
  size 
  of 
  the 
  cheek 
  bones, 
  lessening 
  of 
  the 
  size 
  and 
  massiveness 
  of 
  

   the 
  jaws 
  and 
  teeth, 
  and 
  more 
  generalized 
  beauty. 
  These 
  features, 
  or 
  

   a 
  tendency 
  toward 
  them, 
  are 
  being 
  passed 
  on 
  to 
  the 
  progeny. 
  

  

  The 
  teeth 
  of 
  the 
  more 
  highly 
  civilized 
  white 
  man, 
  through 
  less 
  

   use, 
  have 
  not 
  only 
  become 
  smaller, 
  but 
  especially 
  less 
  resistant, 
  and 
  

   some 
  of 
  them, 
  at 
  least, 
  tend 
  to 
  a 
  tardier 
  eruption, 
  causing 
  many 
  

   difficulties 
  and 
  irregularities. 
  Other 
  changes 
  in 
  size 
  or 
  shape 
  have, 
  

   under 
  the 
  influence 
  of 
  other 
  factors, 
  taken 
  place 
  in 
  the 
  teeth 
  in 
  

   various 
  groups 
  of 
  man. 
  All 
  these 
  changes 
  have 
  become 
  more 
  or 
  less 
  

   hereditary. 
  

  

  The 
  higher 
  civilized 
  man, 
  besides 
  this, 
  has, 
  it 
  seems 
  certain, 
  ad- 
  

   vanced 
  in 
  the 
  lines 
  of 
  human 
  endurance, 
  due 
  to 
  the 
  stresses 
  of 
  civili- 
  

   zation 
  and 
  the 
  calls 
  for 
  endurance. 
  He 
  may 
  not 
  have 
  the 
  more 
  auto- 
  

   matic 
  strength 
  of 
  some 
  primitive 
  people, 
  but 
  his 
  eyes, 
  ears, 
  body, 
  

   and, 
  above 
  all, 
  the 
  brain 
  are 
  evidently 
  capable 
  of 
  greater 
  conscious 
  

   exertions, 
  and 
  endure 
  longer. 
  The 
  last 
  war 
  taught 
  much 
  in 
  this 
  direc- 
  

   tion, 
  and 
  on 
  every 
  side 
  may 
  be 
  seen 
  the 
  great 
  endurance 
  of 
  the 
  finan- 
  

   cier, 
  the 
  industrial 
  leader, 
  the 
  intellectual 
  worker. 
  The 
  amount 
  of 
  

   labor 
  they 
  are 
  able 
  to 
  perform, 
  the 
  strain 
  endured 
  by 
  eyes, 
  all 
  the 
  

   senses, 
  and, 
  above 
  all, 
  the 
  intellectual 
  powers, 
  are 
  at 
  times 
  astound- 
  

   ing. 
  Nothing 
  of 
  that 
  nature 
  is 
  evident 
  in 
  the 
  old 
  times 
  except 
  in 
  

   rare 
  individual 
  mental 
  giants. 
  Qualities 
  appear 
  now 
  manifested 
  by 
  

   multitudes 
  which 
  in 
  the 
  past 
  were 
  barely 
  manifested 
  by 
  individuals. 
  

  

  Therefore, 
  it 
  seems 
  safe 
  to 
  say 
  that 
  the 
  human 
  frame 
  and, 
  above 
  

   all, 
  the 
  human 
  brain, 
  are 
  still 
  quite 
  plastic 
  and 
  respond, 
  by 
  strength- 
  

   ening 
  or 
  weakening, 
  to 
  all 
  sorts 
  of 
  influences. 
  

  

  On 
  the 
  other 
  hand, 
  the 
  natural 
  laws 
  conditioning 
  evolution 
  are 
  

   still 
  acting, 
  except 
  for 
  man's 
  interference. 
  Natural 
  selection 
  still 
  

   eliminates 
  the 
  incurable 
  and 
  unfit, 
  and 
  gives 
  the 
  leadership 
  in 
  prog- 
  

   ress 
  to 
  the 
  strong 
  and 
  fittest. 
  Fault, 
  weakness, 
  transgression 
  of 
  all 
  

   nature's 
  law, 
  must 
  still 
  inexorably 
  be 
  paid 
  for 
  by 
  the 
  defective 
  or 
  

   culpable. 
  Nevertheless, 
  the 
  evolution 
  of 
  man 
  to-day 
  is 
  being 
  more 
  

   and 
  more 
  directed 
  or 
  led 
  by 
  forces 
  different 
  from 
  those 
  in 
  the 
  past. 
  

   Even 
  though 
  nature 
  is 
  still 
  acting, 
  it 
  is 
  being 
  left 
  behind 
  by 
  the 
  

   human 
  factors, 
  by 
  man 
  himself. 
  Man 
  is 
  beginning 
  to 
  materially 
  sup- 
  

   plement 
  and 
  partly 
  to 
  replace 
  nature 
  in 
  the 
  process 
  of 
  his 
  own 
  evo- 
  

   lution, 
  as 
  he 
  has 
  in 
  the 
  case 
  of 
  domesticated 
  animals, 
  and 
  is 
  advancing 
  

   upon 
  nature. 
  

  

  He 
  is 
  using 
  more 
  and 
  more, 
  and 
  ever 
  more 
  effectively, 
  self-protec- 
  

   tion. 
  Survival 
  of 
  the 
  fittest 
  does 
  not 
  apply 
  to 
  man 
  as 
  it 
  once 
  did. 
  

   Natural 
  selection 
  has 
  been 
  modified, 
  so 
  that 
  it 
  means 
  no 
  more 
  the 
  

   survival 
  of 
  the 
  fittest 
  alone, 
  but 
  preservation 
  as 
  well 
  of 
  all 
  who 
  can 
  

   be 
  preserved. 
  Fear 
  is 
  not 
  seldom 
  expressed 
  that 
  this 
  preservation 
  

   of 
  the 
  weaker 
  will 
  have 
  a 
  deleterious 
  effect 
  upon 
  man's 
  future; 
  but 
  

  

  