SOURCES AND ENDS OF HUMAN EFFORT 339 



place in the causal sequence? And clearly the fact 

 that it is my stomach that will ache if I overeat and 

 the emotional pulse that wells up in my consciousness 

 at the anticipation of such a result can be evaluated 

 and treated scientifically as truly — though not as 

 completely — as if I knew all of the neurologic and 

 endocrine activities that condition this emotional 

 pulse. 



And this "vital, personal quality of experience" 

 which Lashley (1923) would throw out of science into 

 art or mysticism is a real datum of experience which 

 is not esoteric or mystic unless we choose to make it 

 so. The demand that we evaluate scientifically sub- 

 jective experience by exactly the same criteria as are 

 adequate in physics and chemistry is a thoroughly un- 

 scientific procedure, for the differentia of mind as I 

 experience it is just this "personal quality" that is (for 

 me) absent in those natural processes that I objectify. 

 Some differentiating features are characteristic of 

 every field of experience that we recognize in our 

 classification of the sciences — biology, astronomy, 

 chemistry, etc. We do not insist that the data ex- 

 perienced in these fields shall be identical, but we do 

 insist that they shall be congruous and that they knit 

 together in a unitary system of nature. And my mind 

 does knit in with the rest of my living in just this 

 way. 



The various departments of experience (the "sci- 

 ences") are differentiated partly in terms of the kinds 



