II THE CONTENTS OF THE MIND 85 



and the elementary states of consciousness under 

 consideration will stand thus : 



A. IMPKESSIONS. 



A. Sensations of 



a. Smell. 



b. Taste. 



c. Hearing. 



d. Sight. 



e. Touch. 



/. Resistance (the muscular sense). 



B. Pleasure and Pain, 

 c. Relations. 



a. Co-existence. 



b. Succession. 



t 



c. Similarity and dissimilarity. 



B. IDEAS. 



Copies, or reproductions in memory, of the fore- 

 going. 



And now the question arises, whether any, and 

 if so what, portion of these contents of the mind 

 are to be termed " knowledge ? " 



According to Locke, " Knowledge is the per- 

 ception of the agreement or disagreement of two 

 ideas ; " and Hume, though he does not say so in 

 so many words, tacitly accepts the definition. It 

 follows, that neither simple sensation, nor simple 

 emotion, constitutes knowledge ; but that, when 



