THE BIONOMICS OF CONVOLUTA ROSCOFFKNSIS. 363 



TheBionomicsof Convolutaroscoffensis, with 

 Special Reference to its Green Cells. 



By 

 F. W. Oainblc, D.Sc, 



Owens College, Manchester; 



And 



Frederick Kceble, IH.A., 



University College, Heading. 



With Plates 30 & 31. 



Contents. 



PAGE 



364 

 368 

 3G8 

 370 

 375 

 377 



Seciion I. — Introduction 



Section 11. — The Food of Convoluta . 



1. Previous Observations 



2. Observations of the Authors 



3. Photosynthesis 



4. Appendix : Assimilation Experiments 

 Section III. — The Development of the " Gkeen Cells " . . 378 



1. The Occurrence and Significance of Ciiloropliyll in Animals . 378 



2. Views of Previous Writers on the Green Ceils of Convol uta . 382 



3. The Origin of the Green Cells .... 383 



4. The Development of tiie Green Cells from Culoutless Pre- 



decessors ....,, 3<J0 



5. The Influence of Ligiit .... 392 

 Section IV. — The Thopisiis of Convoluta . . . 394, 



1. Geotropism ...... 395 



2. Thermotropism ..... 396 



3. Pliototropism : the Influence of Background ; periodic tidal efl'ect 397 



4. 'J'he Influence of Monochromatic Light on Pliototropism . 402 



5. Ilcactions to Two or More simultaneously Applied Stimuli . 405 



6. Rheotropism, Thigmotropism : Applications . . 4O6 



