xiv VEGETABLE PHYSIOLOGY 



absorption by chlorophyll ; absorption of heat rays Fixation of 

 energy Kinetic and potential energy Distribution and liberation 

 of energy Dependence of the plant upon oxygen ; absorption of 

 oxygen and exhalation of carbon dioxide ; apparatus to demon- 

 strate these processes Loss of weight during respiration Varia- 

 tions in the respiratory activity Relation between the absorption 

 of oxygen and the exhalation of carbon dioxide ; the respiratory 

 quotient Exhalation of water during respiration Respiration a 

 function of protoplasm Conditions affecting respiration ; tempera- 

 ture, light, differences of gaseous pressure and of nutritive 

 materials Relation of respiratory processes to local utilisation of 

 potential energy Oxidative actions other than respiration Intra- 

 molecular or anaerobic respiration Fermentation Anaerobic 

 plants 275-303 



CHAPTER XIX 



GROWTH 



Relation of growth to constructive metabolism Definition of growth 

 Distribution of growth Conditions necessary for growth ; plastic 

 materials, turgescence, temperature, oxygen The grand period of 

 growth Growth of a cell and of a multicellular organ The region 

 of growth in the latter Daily period of growth in length The 

 Auxanometer Variations in growth ; hyponasty and epinasty ; 

 nutation and circumnutation Tensions accompanying growth 

 Rectipetality 304-318 



CHAPTER XX 



TEMPERATURE AND ITS CONDITIONS 



Range of temperature through which the vital processes proceed ; 

 photosynthesis, germination Causes and effects of fluctuations of 

 temperature Influence of the light rays on temperature ; impor- 

 tance of anthocyan Absorption of heat by conduction Dissipa- 

 tion of heat in evaporation of water Radiation Nyctitropic 

 movements Loss and gain of heat by conduction Regulation of 

 heat Power of resistance to extremes of temperature . . 319-328 



CHAPTER XXI 



INFLUENCE OF THE ENVIRONMENT ON PLANTS 



Characters of aquatic plants ; influence of a watery environment on 

 structure Xerophytes and their peculiarities Alpine plants 

 Epiphytes Parasites Insectivorous plants 



