﻿THE 
  SYSTEM 
  OF 
  

   ANIMATE 
  NATURE 
  

  

  THE 
  GIFFORD 
  LECTURES 
  DELIVERED 
  IN 
  

  

  THE 
  UNIVERSITY 
  OF 
  ST. 
  ANDREWS 
  

  

  IN 
  THE 
  YEARS 
  1915 
  AND 
  1916 
  

  

  BY 
  

  

  J. 
  ARTHUR 
  THOMSON, 
  M.A., 
  LL.D. 
  

  

  Professor 
  of 
  Natural 
  History 
  in 
  the 
  University 
  of 
  Aberdeen 
  

  

  IN 
  TWO 
  VOLUMES 
  

   VOL. 
  I 
  

  

  LONDON 
  

  

  WILLIAMS 
  & 
  NORGATE 
  

  

  1920 
  

  

  