150 HUME vi 



like effects necessarily follow from like causes, and in a 

 contiguous time and place, their separation for a mo- 

 ment shows that these causes are not complete ones." (I. 

 p. 230.) 



In addition to the bare notion of necessary con- 

 nexion between the cause and its effect, we un- 

 doubtedly find in our minds the idea of something 

 resident in the cause, which, as we say, produces 

 the effect, and we call this something Force, Power, 

 or Energy. Hume explains Force and Power as 

 the results of the association with inanimate causes 

 of the feelings of endeavour or resistance which we 

 experience, when our bodies give rise to, or resist, 

 motion. 



If I throw a ball, I have a sense of effort which 

 ends when the ball leaves my hand; and, if I catch 

 a ball, I have a sense of resistance which comes 

 to an end with the quiescence of the ball. In the 

 former case, there is a strong suggestion of some- 

 thing having gone from myself into the ball; in 

 the latter, of something having been received from 

 the ball. Let any one hold a piece of iron near a 

 strong magnet, and the feeling that the magnet 

 endeavours to pull the iron one way, in the same 

 manner as he endeavours to pull it in the opposite 

 direction, is very strong. 



As Hume says: 



"No animal can put external bodies in motion without 

 the sentiment of a nisus, or endeavour ; and every animal 

 has a sentiment or feeling from the stroke or blow of an 

 external object that is in motion. These sensations, which 



