lAAV 31 1907 



THE GREEN CELLS OF CONVOLUTA ROSCOFFENSIS. 167 



The Origin and Nature of the Green Cells of 

 Convoluta roscoffensis. 



By 

 Frederick Keeble, M.A., Sc.D., 



University College, Reading, 



and 

 F. ^V. Oniiilile, D.Sc., 



Manclie&ter University. 



With Plates 13 and 14. 



Contents. 



PAGE 



Section I. Introduction .... 167 



„ II. Proof of the Origin of the Green Cells by Infection 172 

 ,, III. The Isolation of the Infecting Organism and the 



Synthesis of tlie Green Convoluta . . 179 



,, IV, The Life-history of the Infecting Organism . 182 



„ V. The Normal Course of Infection . . 191 



„ VI. The Significance and the Consequences of the 



Association of Animal and Green Cell . 199 



„ VII. General Summary . . .208 



Tables I-VI . . . . .210 



Literature . . . . .216 



Explanation of Plates . . . . 217 



Section I. Introduction. 



Xanthellj^: and ChlorellaG are widely distributed among 

 the members of the basal groups of the animal kingdom. In 



vol. 51, PART 2. — NEW SERIES. 14 



