CONTENTS 



CHAPTER IV 



THE AUTOMATIC RECORD OF THE RATE OF 

 EVOLUTION OF OXYGEN 



PAGE 



The Automatic Recorder — Electric Pencil with double contact — The 

 Electromagnetic Writer — Condenser for elimination of sparks — 

 Recording Drum — The Governor for variation of speed within 

 wide limits — The Ink-Recorder — Maintenance of constancy of 

 external conditions — Radiant point as a source of light — The 

 experimental procedure — Constancy of results — Advantages of 

 the Automatic Method 21 



CHAPTER V 



PHOTOSYNTHESIS UNDER INCREASING INTENSITY 



OF LIGHT 



The unit intensity of light — Photosynthetic curve under increasing 

 intensity of light from Pointolite — Period for ph\ siological adjust- 

 ment to changed intensity of light — -Experiments with spring- and 

 winter-specimens — Formula for determination of photosynthetic 

 activity under changed intensity of light — Determination of the 

 coefficient by the Differential Method — Ratio of activities in 

 spring and winter. ........ 31 



CHAPTER VI 



RELATION BETWEEN THE QUANTITY OF LIGHT 

 AND THE AMOUNT OF PHOTOSYNTHESIS 



Comparison of photosynthetic effectiveness of sunlight and Point- 

 olite — The limiting maximum, relative and not absolute — 

 Dependence of the maximum on intensity of stimulus — 

 Physiological equivalence of Pointolite and sunlight — The 

 Hydrilla plant as a photometer — Effect of duration, intensity 

 and directive angle of light on activity — Relation between 

 the quantity of light and activity . ..... 41 



CHAPTER VII 



THE PHYSIOLOGICAL FACTOR IN PHOTOSYNTHESIS 



The anabolic and catabolic processes A and D — External manifesta- 

 tions of A and D effects — Photosynthetic and phototropic curves 

 — Dependence of maximum response on the intensity of stimulus 

 — Effect of variation of temperature — D effect due to shock- 



