_Often passes for Perception._--It was remarked, in treating of perception, that very much which passes under that name is in reality only conception. I hear, for example, a carriage passing in the street. All that I really perceive is the sound; but that single perception recalls at once the various perceptions that have formerly been associated with it, and so there is at once reproduced in my mind the _conception_ of the passing carriage. Our conviction of the existence and reality of the object thus conceived, is hardly inferior to that produced by actual and complete perception. _Correctness of our Conceptions._--In general it may be remarked, that our conceptions are more or less adequate and correct representations of the objects to which they relate, according as they combine the reports of more or fewer different senses, respecting more or fewer different qualities, and as these reports are more or less clear and distinct. II. LAWS OF MENTAL REPRODUCTION. _Conceptions not uncaused._--It is evident that our conceptions arise not uncaused and at hap-hazard, but according to some law. There is a method about the phenomena of mental reproduction. There is a reason why any particular scene or event of former experience, any perception or sensation, is brought again to mind, when it is, and as it is, rather than some other in its place. A careful observation and study of the laws which regulate in general the succession of thought, will furnish the explanation and true philosophy of mental reproduction. _Principle of Suggestion._--Every thought which passes through the mind is directly or indirectly connected with, and suggested by something which preceded; and that something may be either a sensation, a perception, a conception, or an emotion. The precedence may be either immediate or remote. Some connection there always is between any given thought or feeling at any moment before the mind, and some preceding thought or feeling, which gives rise to, occasions, suggests, the latter. These suggestions follow certain general rules or laws, which are usually called the _laws of association_. These laws, so called, are only the different circumstances under which the suggestions take place, and are termed laws only to indicate the regularity and uniformity with which, under given circumstances given thoughts and feelings are awakened in the mind.