ANIMAL INTELLIGENCE 
CHAPTER I 
THE Stupy oF CONSCIOUSNESS AND THE STUDY OF 
BEHAVIOR 
THE statements about human nature made by psycholo- 
gists are of two sorts, — statements about consciousness, 
‘about the inner life of thought and feeling, ~ the ‘sélf “as 
conscious,’ the ‘stream of thought’; and ‘statements about 
behavior, about the life of man that is left unexplained 
by physics, chemistry, anatomy and physiology, and is 
roughly compassed for common sense by the terms ‘in- 
tellect’_and_‘ character.’ ' 
\Animal psychology | shows the same double content. 
Some statements concern ‘the conscious states of the animal, 
what he is to himself as an inner life; others concern his 
original and acquired ways of response, his behavior, what 
‘he is to an outside observer. : 
Of the psychological terms in common use, some refer 
only to conscious states, and some refer to behavior regard- 
less of the consciousness accompanying it; fy but the majority 
are ambiguous, referring to the man or animal in question, 
at times in his aspect of inner life, at times in his aspect of 
reacting organism, and ‘at times as an undefined total 
nature. ' Thus ‘intensity,’ ‘duration’ and ‘quality’ of 
sensations, ‘transitive’ and ‘substantive’ states and ‘ 
agery’ almost inevitably refer to states of conscious- 
B I 
