﻿Monstrosities 
  401 
  

  

  shows 
  that 
  some 
  internal 
  hereditary 
  quality 
  is 
  

   present, 
  though 
  often 
  latent, 
  and 
  that 
  the 
  ob- 
  

   served 
  anomalies 
  are 
  to 
  be 
  regarded 
  as 
  re- 
  

   sponses 
  of 
  this 
  innate 
  tendency 
  to 
  external 
  con- 
  

   ditions. 
  Our 
  two 
  types 
  differ 
  in 
  the 
  frequency 
  

   of 
  these 
  responses. 
  Bare 
  in 
  the 
  poor 
  race, 
  they 
  

   are 
  numerous 
  in 
  the 
  rich 
  variety. 
  The 
  external 
  

   conditions 
  being 
  the 
  same 
  for 
  both, 
  the 
  heredi- 
  

   tary 
  factor 
  must 
  be 
  different, 
  The 
  tendency 
  is 
  

   weak 
  in 
  the 
  one, 
  and 
  strong 
  in 
  the 
  other. 
  In 
  

   both 
  cases, 
  according 
  to 
  my 
  experience, 
  it 
  may 
  

   be 
  weakened 
  or 
  strengthened 
  by 
  selection 
  and 
  

   by 
  treatment. 
  Often 
  to 
  a 
  very 
  remarkable 
  de- 
  

   gree, 
  but 
  not 
  so 
  far 
  as 
  to 
  transgress 
  the 
  limits 
  

   between 
  the 
  two 
  races. 
  Such 
  transgression 
  

   may 
  apparently 
  be 
  met 
  with 
  from 
  time 
  to 
  time, 
  

   but 
  then 
  the 
  next 
  generation 
  generally 
  shows 
  

   the 
  fallacy 
  of 
  the 
  conclusion, 
  as 
  it 
  returns 
  more 
  

   or 
  less 
  directly 
  to 
  the 
  type 
  from 
  which 
  the 
  strain 
  

   had 
  been 
  derived. 
  

  

  Monstrosities 
  should 
  always 
  be 
  studied 
  by 
  

   physiologists 
  from 
  this 
  point 
  of 
  view. 
  Poor 
  

   and 
  rich 
  strains 
  of 
  the 
  same 
  anomaly 
  seem 
  at 
  

   first 
  sight 
  to 
  be 
  so 
  nearly 
  allied 
  that 
  it 
  might 
  be 
  

   thought 
  to 
  be 
  very 
  easy 
  to 
  change 
  the 
  one 
  into 
  

   the 
  other. 
  Nevertheless 
  such 
  changes 
  are 
  not 
  

   on 
  record, 
  and 
  although 
  I 
  have 
  made 
  several 
  at- 
  

   tempts 
  in 
  this 
  line, 
  I 
  never 
  succeeded 
  in 
  passing 
  

   the 
  limit. 
  I 
  am 
  quite 
  convinced 
  that 
  sometime 
  

  

  