XVI CONTENTS 



PAGE 



The Eudiometer and the Balance — Modification of the carbo- 

 hydrate-factor by external conditions — Effect of strong light 

 and of semi-darkness . . . . . . . .211 



CHAPTER XXV 



EFFICIENCY OF THE PHOTOSYNTHETIC ORGAN 

 IN STORAGE OF SOLAR ENERGY 



Different determinations of the efficiency of the photosynthetic 

 organ — Error arising from incorrect values of carbohydrate-factor 

 and of heat of combustion of the photosynthetic product — 

 Unsatisfactory determination of losses by reflection, by emission 

 and by transpiration — Elimination of these losses in water-plants 

 — Radiometric and calorimetric determinations of energy — Deter- 

 mination of the coefficients of transmission and of absorption by 

 the Radiometer and by the Calorimeter — Simultaneous deter- 

 mination of energy absorbed and of energy stored — Typical 

 examples — Comparatively high efficiency of the photosynthetic 

 storage of energy ......... 222 



CHAPTER XXVI 



THE PHYSIOLOGICAL SCALE AND THE LAW OF PHOTO- 

 SYNTHESIS FOR THE DIFFERENT FACTORS 



Different variable factors in photosynthesis — The characteristic 

 curve — Scale of measurement — Thermometric and absolute zero 

 — Physiological scale and the determination of the zero point — 

 Determination of the coefficient and the law of variation of 

 photosynthesis under variation of temperature — C0 2 -coefficient 

 and the photosynthetic law for variation of CO z -concentration — 

 Coefficient for light and the law of photosynthesis for varying 

 intensity of light — Photosynthesis under variation of tonic 

 condition .......... 239 



CHAPTER XXVII 



PHOTOSYNTHESIS UNDER SIMULTANEOUS 

 VARIATION OF DIFFERENT FACTORS 



Problem of effect of simultaneous variation — Mutual interaction or 

 independent reaction unaffected by other factors — Law of Pro- 

 duct — Combined effect of increasing complexity — I . Two \ ariable 



