PROLEGOMENA. XIX. 



correct them by the universal consent of Authority, 

 to be one of the best and safest definitions of 

 unsoundness of mind. This also holds good with 

 regard to \Yhat are called moral truths. All 

 ideas, notions, and opinions of every kind, are 

 manifested by the actions of the sensorium or 

 that nervous arrangement in our Bodies by which 

 God has placed our internal Minds, that is our 

 Selves, in relation to the external world or lo 

 ThinjTS- That there are external and continuous 

 existences no one doubts, for instance, the whole 

 external world and other people exist, God exists, 

 and so on, and this continuous and external 

 existence, which every one believes, as a general 

 truth, out of the instincts of his own nature, is 

 capable of being metaphysically proved also, as 

 has been ably done by a work " on the Perception 

 of an External Universe," to which I have 

 alluded. But the question whether any particular 

 truth, or, in other words, any particular sensation, 

 be the result of a corresponding- external and con- 

 tinuously existing object, showing itself to the 

 mind through the intervention of the sensorium ; 

 or whether it be an illusive sensation, produced 

 by the imaginative faculty of the sensorium 

 itself, must be determined by the consent of other 

 people, that is referred to Authority. 



Now to make this argument perfect, I must 

 observe that there are as many warps of individual 



