X TABLE OF CONTENTS 



CHAPTER XIV 



Factors Involved in Regulating Reactions to Light — Variability 

 AND Modifiability IN Behavior (continued) 



PAGE 



1. Changes in Sensitiveness, in the Optimum, and in Various Other 



Features regarding Reactions 288 



2. General Summary of Part III 298 



PART IV 



REACTIONS IN LIGHT OF DIFFERENT WAVE-LENGTHS OR 

 ; COLORS 



CHAPTER XV 

 Energy, Photochemical Reactions, and Brightness 



1. Energy Distribution in the Spectrum 304 



2. Brightness Distribution in the Spectrum 305 



3. Distribution of Actinic Effect in the Spectrum 308 



CHAPTER XVI 

 Effect of Different Rays on the Reactions of Sessile Plants 

 I. Summary 319 



CHAPTER XVII 



The Relative Effect of Different Rays on the Reactions of 



Unicellular Forms 



1. Strasburger's Experiments 321 



2. Engelmann's Experiments 322 



a. Diatoms and Oscillaria with different species of Navicula 

 and Pinnularia as types; b. Cihates which have chlo- 

 rophyll with Paramecium bursaria as a type; c. Flagel- 

 lates with Euglena viridis as a type. 



3. Verworn's Experiments 326 



4. Experiments of Harrington and Leaming on Amoeba 327 



5. Original Observations on Amoeba 328 



a. Experiments with color filters; b. Experiments with the 

 solar spectrum. 



