LIST OF ILLUSTRATIONS 



PAGE 



Diagram of Biological Processes . . Frontispiece 



Osazones ......... 6 



Cholesterol Crystals 16 



Diffusion and Osmosis ....... 28 



Diagram of vapour pressure of a solution .... 30 



Method for measurement of electrical conductivity of 



solutions ........ 34 



Method for measurement of hydrogen ion concentration . 40 

 Colour change of indicators . . . . . .44 



Diagram of ultramicroscope . . . . . .51 



Field of vision of ultramicroscope . . . facing 51 



Sols and gels ..... 52 



Effect of T on rate of reaction ...... 60 



Optimum T for enzymes. ...... 61 



Plasmolysis ......... 78 



Effect of surface tension on a fluid drop . . . .84 



Amoeba moving ........ 86 



Pulvinus ..... .... 86 



Muscle contraction ........ 87 



Limiting factors ........ 92 



Relation of assimilation to CO 2 supply, T, and illumination. 94 

 Spectra of plant pigments .... facing 97 



Effect of spectral colours on starch formation. 99 



Alimentary canal in mammals . . . . . 115 



Circulation in mammals . . . . . . 133 



Villus .......... 134 



Respiration calorimeter . . . . . . .143 



Deficiency of A . . . . . facing 152 



Deficiency of B ...... ,, 153 



Stoma . . . . . . . . . .156 



Lenticel . . . . . . . . .156 



XV 



