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THE GRAMMAR OF SCIENCE 



immediate sense-impressions we project outside ourselves 

 and hold to be part of the external world. As such we 

 call it a phenomenon, and in practical life term it real. 

 Together with the immediate sense-impression we often 

 include something drawn from our store of past sense- 

 impressions, which experience has taught us to associate 



Fig. I. 



with the immediate sense-impression. Thus we assume 

 the blackboard to be hard, although we may only have 

 seen its shape and colour. What we term the real world 

 is thus partly based on immediate sense-impressions, partly 

 on stored sense-impresses ; it is what has been called a 

 construct. For an individual the distinction between the 

 real world and his thought of it is the presence of some 



