CONTENTS 



Preface 



I Introduction 

 II Form and Function in Stentor 



III Behavior 



1. Food selection 



2. Swimming 



3. Avoiding reaction and learning 



4. Response to light 



5. Response to heat and electric current 



6. The question of sensory cilia . . 



7. Cystment . . 



IV Fine Structure 



1. Feeding organelles 



(a) Frontal field 



(b) Oral pouch 



(c) Membranellar band 



(d) Gullet 



2. Holdfast . . 



3. Cytopyge 



4. Contractile vacuole 



5. Cortical structure 



(a) The cell surface . . 



(b) Granular stripes; nature of the pigment and 



granules. . 



(c) Clear stripes and their fiber systems 



(d) Fiber systems of doubtful status 



(e) The cilia . . 



6. Fine structure of the nuclei 



7. The endoplasm . . 



V Grov^th and Division 



1. Growth . . 



2. The course of normal division . . 



3. Nature and location of the fission line 



4. Incitement to division . . 



5. Persistence of division . . 



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