CHAPTER III. 



HUMAN SENSATION AND PERCEPTION. 



IN man, as it has been clearly proved, sensations and 

 perceptions occur both physiologically and psychi- 

 cally just as they do in animals. If science and the 

 rational process of the interpretation of things have 

 their origin and are evolved in us by the duplication 

 of our faculties, such a function, which is due to this 

 duplication, is very slowly developed and exercised, 

 and in its origin, as an effort of the intelligence, it 

 does not differ from that of animals. 



It is true that the internal act of the higher 

 faculty of reflection has hardly taken place before man 

 unconsciously enters on a new and vast apprentice- 

 ship, which soon distinguishes him from and exalts 

 him above the animal kingdom ; science has already 

 put forth its first germ. But the reasoning and 

 simply animal faculties were so mingled, that for a 

 long while they were confounded together in their 

 effects and results, as well as in their natural 

 methods. We must therefore begin by considering 



