CONTEXTS 



PART L THE STRUCTURE AND FUNCTIONS OF 

 ORGANISMS THE CELL THEORY 



CHAPTER I 



MOT 



Introductory: The nature of life The living organism viewed as a 

 machine The essential functions of the living body The source 

 of energy in living things 1 



CHAPTER n 

 Amoeba as a typical organism The properties of protoplasm . . . 13 



CHAPTER TTT 

 Hjematocoecus The differences between animals and plants . . 27 



CHAPTER IV 



The cell theory Unicellular organisms Differentiation and division 

 of labour Co-operation The transition from the unicellular to 

 the multicellular condition The early development of niulticeilular 

 animals and plants 36 



CHAPTER V 



The cell theory as illustrated by the histologies! structure of the higher 

 animal* and plants Limitations of the cell theory The cell as 

 the physiological unit 51 



CHAPTER YI 

 The multiplication of cells Alitotic and amitotic nuclear division . 69 



PART H. THE EVOLUTION OF SEX 



CHAPTER \TI 



Limitation of the powers of cell-division Rejuvenescence by conjuga- 

 tion of gametes The origin of sex in the Protista ... 81 



