THE DEVELOPING CONCEPT AND ITS FUNCTIONS 2OI 



mutual relationships within the group, the group as a whole would 

 lose all connection with the developing body of cognitive experi- 

 ence it would be simply a useless mass of dead matter. In 

 other words, an uneliminable condition for the continued func- 

 tioning of a concept is its very plasticity and indeterminateness 

 its lack of 'clearness and distinctness.' 



