﻿LECTURE 
  XIV 
  

  

  MONSTROSITIES 
  

  

  I 
  have 
  previously 
  dealt 
  with 
  the 
  question 
  of 
  

   the 
  hereditary 
  tendencies 
  that 
  cause 
  monstros- 
  

   ities. 
  These 
  tendencies 
  are 
  not 
  always 
  ident- 
  

   ical 
  for 
  the 
  same 
  anomaly. 
  Two 
  different 
  

   types 
  may, 
  generally, 
  be 
  distinguished. 
  One 
  of 
  

   them 
  constitutes 
  a 
  poor 
  variety, 
  the 
  other 
  a 
  rich 
  

   one. 
  But 
  this 
  latter 
  is 
  abundant 
  and 
  the 
  first 
  

   one 
  is 
  poor 
  in 
  instances 
  of 
  exactly 
  the 
  same 
  con- 
  

   formation. 
  Therefore 
  the 
  difference 
  only 
  lies 
  

   in 
  the 
  frequency 
  of 
  the 
  anomaly, 
  and 
  not 
  in 
  its 
  

   visible 
  features. 
  In 
  discovering 
  an 
  instance 
  of 
  

   any 
  anomaly 
  it 
  is 
  therefore 
  impossible 
  to 
  tell 
  

   whether 
  it 
  belongs 
  to 
  a 
  poor 
  or 
  to 
  a 
  rich 
  race. 
  

   This 
  important 
  question 
  can 
  only 
  be 
  answered 
  

   by 
  direct 
  sowing-experiments 
  to 
  determine 
  the 
  

   degree 
  of 
  heredity. 
  

  

  Monstrosities 
  are 
  often 
  considered 
  as 
  acci- 
  

   dents, 
  and 
  rightfully 
  so, 
  at 
  least 
  as 
  long 
  as 
  they 
  

   are 
  considered 
  from 
  a 
  morphological 
  point 
  of 
  

   view. 
  Physiology 
  of 
  course 
  excludes 
  all 
  acci- 
  

   dentality. 
  And 
  in 
  our 
  present 
  case 
  it 
  also 
  

  

  400 
  

  

  