DEFINITION AND PUOV1NCE OF LOGIC. 9 



materials furnished from without. To this science 

 appertain the great and much debated questions of 

 the existence of matter ; of the existence of spirit, 

 and the distinction between it and matter; of the 

 reality of time and space, as things without the mind, 

 and distinguishable from the objects which are said to 

 exist in them. For, in the present state of the dis- 

 cussion on these topics, it is universally allowed that 

 the existence of matter or of spirit, of space or of 

 time, is, .in its nature, unsusceptible of being proved; 

 and that whatever is known of them, is known by 

 immediate intuition. To the same science belong the 

 inquiries into the nature of Conception, Perception, 

 Memory, and Belief; all of which are operations of 

 the understanding in the pursuit of truth ; but with 

 which, as phenomena of the mind, or with the possi- 

 bility which may or may not exist of analyzing any 

 of them into simpler phenomena, the logician as such 

 has no concern. To this science must also be referred 

 the following, and all analogous questions : To what 

 extent our intellectual faculties and our emotions are 

 innate to what extent the result of association. 

 Whether God, and duty, are realities, the existence of 

 which is manifest to us a priori by the constitution 

 of our rational faculty ; or whether our ideas of them 

 are acquired notions, the origin of which we are able 

 to trace and explain ; and the reality of the objects 

 themselves a question not of consciousness or intui- 

 tion, but of evidence and reasoning. 



The province of logic must be restricted to that 

 portion of our knowledge which consists of inferences 

 from truths previously known ; whether those ante- 

 cedent data be general propositions, or particular 

 observations and perceptions. Logic is not the 

 science of Belief, but the science of Proof, or 



