﻿THE 
  LAW 
  OF 
  INCREASE. 
  l6l 
  

  

  and 
  the 
  earliest 
  possibilities 
  of 
  material 
  civi- 
  

   lization 
  would 
  arise. 
  

  

  Now 
  what 
  are 
  the 
  changes 
  of 
  external 
  cir- 
  

   cumstance 
  which 
  first, 
  in 
  the 
  natural 
  course 
  

   of 
  things, 
  would 
  bring 
  an 
  adverse 
  influence 
  to 
  

   bear 
  upon 
  Mankind 
  ? 
  Here 
  again 
  we 
  are 
  on 
  

   firm 
  ground, 
  because 
  we 
  know 
  one 
  great 
  

   cause 
  which 
  has 
  been 
  always 
  operating, 
  and 
  

   we 
  know 
  its 
  natural 
  and 
  inevitable 
  effects. 
  

   This 
  cause 
  is 
  simply 
  the 
  law 
  of 
  increase. 
  It 
  

   is 
  the 
  consequence 
  of 
  that 
  law 
  that 
  popula- 
  

   tion 
  is 
  always 
  pressing 
  upon 
  the 
  limits 
  of 
  

   subsistence. 
  Hence 
  the 
  necessity 
  of 
  migra- 
  

   tions, 
  and 
  the 
  force 
  which 
  has 
  propelled 
  suc- 
  

   cessive 
  generations 
  of 
  men 
  farther 
  and 
  farther, 
  

   in 
  ever-widening 
  circles 
  round 
  the 
  original 
  

   centre 
  or 
  centres 
  of 
  their 
  birth. 
  Then, 
  as 
  it 
  

  

  M 
  

  

  