TABLE OF CONTENTS. 



SERIES I. 



NATURE OF THE MATERIAL WORLD ; AND THE SCALE OF UNORGANIZED 

 AND ORGANIZED TRIBES THAT ISSUE FROM IT. 



I^ECT. Page 

 f . On Matter, and a Material World -------- 9 



II. On the Elementary and Constituent Principles of Things - 20 



III. The Subject continued - ---29 



IV. On the Properties of Matter, essential and pecuUar - - 39 

 V. The Subject continued ---47 



VI. On Geology - 66 



VII. The Subject continued 66 



VIII. On Organized Bodies, and the Structure of Plants com- 

 pared with that of Animals - -- - 76 



IX. On the general Analogy of Animal and Vegetable life - 89 



X. On the Principles of Life, Irritability, and muscular Motion 100 



XI. On the Bones, Cartilages, Teeth, Hair, Wool, Silk, Fea- 



thers, and other hard or solid Parts of the Animal 

 Frame - - . . 113 



XII. On the Digestive Function, and the Organs contributory 



to it ; the different Kinds of Food employed by differ- 

 ent Animals ; and the Continuance of Life through 

 long Periods of fasting 128 



XIII. On the Circulation of the Blood, Respiration, and Animal- 



ization 143 



XIV. On the Processes of Assimilation and Nutrition ; and the 



interesting Effects to which they lead - - - » - - 159 

 XV/ On the External Senses of Animals ~ ~ - ~ - ^ ~ 168 



