n THE CONTENTS OF THE MIND 85 



A. IMPRESSIONS. 



A. Sensations of 



a. Smell. 

 I. Taste. 



c. Hearing. 



d. Sight. 



e. Touch. 



f. Kesistance (the muscular sense). 



B. Pleasure and Pain. 

 c. Eelations. 



a. Co-existence. 



&. Succession. 



c. Similarity and dissimilarity. 



B. IDEAS. 



Copies, or reproductions in memory, of the 

 foregoing. 



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 

 impressions of relation are added to these im- 

 pressions, or their ideas, knowledge arises; and 

 that all knowledge is the knowledge of likenesses 

 and unlikenesses, co-existences and successions. 



