XIV 



CONTENTS 



II. 



III. 

 IV. 



Movements of Flagella and Cilia 



(a) Cells with Flagella 



(b) Cells with numerous Cilia ...... 



The Contractile Vacuoles, or Vesicles, of Unicellular Organisms 

 Changes in the Cell during passive movement 



Literature 



PAGB 



77 

 79 

 83 

 85 

 88 

 89 



CHAPTEE IV. 



The Vital Pboperties of the Cell ....... 91 



Phenomena of Stimulation ......... 91 



I. Thermal Stimuli 94 



II. Light Stimuli 99 



III. Electrical Stimuli 106 



Phenomena produced hy Galvanotropism 108 



IV. Mechanical Stimuli 110 



V. Chemical Stimuli Ill 



(a) Chemical Stimuli which affect the whole body . . .112 



(b) Chemical Stimuli which come into contact with the Cell body 



at one spot only 115 



1. Gases 115 



2. Liquids 117 



Literature ............ 123 



CHAPTEE V. 



The Vital Properties of the Cell ..... 



Metabolism and Formative Activity 



1. Absorption and Excretion ...... 



1. The Absorption and Excretion of Gaseous Material 



2. The Absorption and Excretion of Fluid Substances 



3. The Absorption of Solid Bodies 

 II. The Assimilative and Formative Activity of the Cell 



1. The Chemistry of Assimilation 



2. The Morphology of Metabolism 



(a) Internal Plasmic Products 



(b) External Plasmic Products 

 Literature ...... 



126 



126 

 128 

 128 

 133 

 141 

 145 

 146 

 154 

 154 

 166 

 174 



CHAPTEE VI 



The Vital Phenomena of the Cell 



Eeproduction of the Cell by division 



I. History of Cell-formation 

 II. Nuclear Division .... 



177 



177 

 177 



179 



