CONTENTS. 



PAGE 

 INTRODUCTION ... i 



PART I. 

 TRACES OF UNITY IN FORM. 



Chapter I. Traces of unity in plants .. 13 



,, II. Traces of unity in the limbs of vertebrate 



animals 24 



,, III. Traces of unity in the appendicular organs of 



invertebrate animals 35 



,, IV. Traces of unity in the skull and vertebral 



column 54 



,, V. Traces of unity in the vertebra and annellus ... 58 



,, VI. Traces of unity in the animal as a whole ... .. 69 



,, VII. Traces of unity in plants and animals 75 



,, VIII. Traces of unity in organic and inorganic forms ... 83 



PART II. 

 TRACES OF UNITY IN FORCE. 



Chapter I. Traces of unity in the various modes of physical 



force ... 91 



,, II. Traces of unity in vital and physical motion ... no 

 ,, III. Traces of unity in the vivifying power of light 



and heat ... 147 



