CONTENTS 



IX 



5. Competition among loci of stripe contrast; 



regeneration and obliteration of primordium sites 



6. Exceptions 



XI Polarity 



1 . Fixity of structural polarity 



2. Rate of regeneration in relation to the polar axis 



3. Gradients in head and tail formation 



XII Fusion Masses of Whole Stentors 

 I. Simple masses and biotypes 

 2. 

 3. 

 4- 

 5. 



Adjustments among formed ectoplasmic organelles 



Larger masses and reduction of oral valency . . 



Incomplete oral differentiation . . 



Absence of fission 



Tubes and ciliated vacuoles 



XIII Reconstitution in Disarranged Stentors 



1. Minced stentors . . 



2. Other disarrangements of the normal cell pattern 



XIV Analysis of Stentor Through Its Response to 



External Agents 



1 . Action of the membranellar band 



2. Coordination of body cilia 



3. Ciliary anaesthesia 



4. Anaesthesia of myonemes 



5. Comparison of osmotic effects to cooling 



6. Acceleration of division . . 



7. Changes in state of the protoplasm 



8. Tests for an antero-posterior metabolic gradient 



9. Acquired tolerance to external agents . . 



10. Shedding of pigment and pellicle 



1 1 . Shedding of the membranellar band . . 



12. Morphogenetic effects . . 



13. Inhibition of growth by X-ray, and other effects 



14. Effect of temperature on size . . 



XV Metabolism . . 



1 . Effects of starvation 



2. Storage and utilization of nutrient reserves 



3. Respiration 



4. Digestion . . . . . . " . . 



5. Symbiosis with green algae 



6. Parasites of stentor 



7. Abnormal stentors 



(a) Depigmented stentors 



(b) Over-pigmented stentors 



(c) Amorphous stentors 



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