TABLE OF CONTENTS xi 



MIHAP. piOK 



that they axe controlled by laws peculiar to themselves ; but, on 

 )(j^ the contrary, that it is true that the laws, which regulate the 



changes occurring in bodies, meet with very different conditions 

 ^ in living bodies from those that they find in lifeless bodies, and 



hence work upon the former results very diflEerent from those 

 worked upon the latter. 



That living bodies have the faculty of building up their own 



substance for themselves and thus forming combinations which 



would never have come into existence without them ; hence their 



remains furnish the material which serves for the formation of the 



ill various minerals. 



III. Op the Faculties common to all Living Bodies - 259 



That life endows all bodies which possess it with certain faculties 

 in common, and that the production of these faculties requires no 

 special organ whatever, but only such a state of things in the 

 parts of these bodies as may enable life to exist in them. 



21SIX. Op the Faculties peculiar to certain Living Bodies 265 

 That, in addition to the faculties conferred by life on all living 

 bodies, some living bodies have faculties which are altogether 

 peculiar to themselves. Now observation shows that these latter 

 faculties only arise, when special organs, capable of producing 

 them, exist in the animals possessing such faculties. 



DMMARY OP Part II. 280 



2} PART III. 



N ENQUIRY INTO THE PHYSICAL CAUSES OF FEELING, INTO THE 

 FORCE WHICH PRODUCES ACTIONS, AND LASTLY INTO THE 

 ORIGIN OF THE ACTS OF INTELLIGENCE OBSERVED IN 

 VARIOUS ANIMALS. 



^troduction - - - - - . 285 



Some general observations on the means possessed by nature, 

 for giving rise in living bodies to the phenomena known as sensa- 

 tions, ideas and the various acts of intelligence. 



I. Of the Nervous System, its Formation, and the 291 



VARIOUS sorts of FUNCTIONS THAT IT CAN FULFIL 



That the system of organs, called the nervous system, is limited 



to certain animals, and that among those which possess it, it is 



found in different degrees of complexity and perfection ; that 



