CONTENTS 



analysis — Interpretation — Fibrillar systems of other 

 ciliates — Holotricha — Heterotricha - — Oligotricha — 

 Hypotricha^Conclusions — Literature cited 



V. Motor Response in Unicellular Animals By S. O. 

 Mast, Director, Zoological Laboratory, Johns Hop- 

 kins University 271 



Introduction — Responses to light — Rhizopods — Flagel- 

 lates — Ciliates — Colonial organisms — Responses to elec- 

 tricity- — Rhizopods — Flagellates — Ciliates — Colonial or- 

 ganisms — Responses to Chemicals — Rhizopods— Ciliates 

 — Literature cited 



VI. Respiratory Metabolism By Theodore Louis Jabn, 



State University of lotva 352 



Purposes of studying respiration — Methods of measuring 

 aerobic respiration — Aerobic respiration — Investigations 

 which concern the source of energy — Investigations 

 which concern the mechanism of respiration — The 

 measurement of anaerobic metabolism and glycolysis — 

 Occurrence of anaerobiosis and glycolysis — Why are 

 anaerobes anaerobes, and aerobes aerobes? — Oxida- 

 tion-Reduction potential versus respiration and growth — 

 Literature cited 



Vn. The Contractile Vacuole By J. H. Weatherby, Medi- 

 cal College of Virginia 404 



Introduction — The origin of contractile vacuoles — The 

 structure of contractile vacuoles — The function of con- 

 tractile vacuoles — Contractile vacuoles and the Golgi 

 apparatus — Conclusion — Literature cited 



VIII. The Technique and Significance of Control in Proto- 

 zoan Culture By George W. Kidder, Brotvn University 448 



Introduction — The problem of protozoan sterilization — 

 General material — General methods of sterilization — ■ 

 Special methods and manipulations — The importance of 

 adequate sterility tests — Establishment of sterilized Pro- 

 tozoa in culture — Literature cited 



