CONTENTS. 



CHAPTER I. 



PAGE 



Definition of Biology — Differences between dead and living bodies 

 — Nature and conditions of life — Physical basis of life — Pro- 

 toplasm — Connection between life and the matter of life — Or- 

 ganisation — Light — Air — Temperature — Death — Use of 

 the term " vital force," 1-18 



CHAPTER n. 



Differences between animals and plants — Regnum Protisticum of 

 Plaeckel — Higher plants distinguished from higher animals — 

 Comparison of the lower animals with the lower plants — 

 Form — Internal structure — Chemical composition — Power of 

 locomotion — Nature of the food, . . . . . ^9'^S 



CHAPTER III. 



Differences between different organisms — Morphology — Physiology 

 — Specialisation of functions — Morphological type — Synopsis 

 of the main divisions of the animal and vegetable kingdoms, 26-43 



CHAPTER IV. 



Analogy — Homology — Serial Homology — Lateral Homology — 

 Homogeny and Homoplasy — Homomorphism — Mimicry- 

 Correlation of growth, ....... 44-5 



