TABLE OF CONTENTS XI 



CHAPTER XVIII 



Reactions of Multicellular Animals in Light Consisting of Waves 



Differing in Length 



PAGE 



1. Experiments of Wilson on Hydra S33 



2. Bert's Experiments on Daphnia 336 



3. Lubbock's Experiments on Daphnia 337 



4. Experiments of Yerkes on Simocephalus 341 



5. Experiments of Graber on Various Animals 343 



6. Loeb's Observations 346 



CHAPTER XIX 



Brief Consideration of the Reactions of Multicellular Animals 

 With Well-developed Eyes in Light Differing in Color — With 

 Special Reference to Color Vision. 



1. Ants 348 



2. Bees 352 



3. Higher Crustacea — Experiments of Minkiewicz 355 



4. Fishes 358 



5. General Summary and Conclusions of Part IV 360 



CHAPTER XX 



Theoretic Considerations 366 



Bibliography 379 



Index 393 



