XU CONTENTS 



17. The Enterococcus 266 



18. Streptococcus pyogenes 266 



3. Phenomena Simulating Bacteriophagy 266 



B. anthracis 266 



B. pyocyaneus -. 267 



Resume 269 



PART II. THE BACTERIOPHAGE 

 Chapter I 



THE BEHAVIOR OF THE BACTERIOPHAGE TOWARD DIFFERENT AGENTS 



1. The Physical State of the Bacteriophage 273 



Filtrability 274 



Diffusibility 277 



Volatility 277 



Sedimentation 280 



Nature of the "Substance" of the bacteriophage corpuscle 281 



2. Conservation of the Bacteriophage Corpuscle 283 



3. Flocculation of Corpuscles 287 



4. Adsorption of Bacteriophage Corpuscles 288 



5. Effects of Irradiation 291 



6. Effect of Temperature 292 



7. Action of Inorganic Chemical Substances 300 



8. Action of Organic Compounds 302 



9. Variability in the Resistance of the Bacteriophage 306 



Resume 307 



Chapter II 



HYPOTHESES CONCERNING THE NATURE OF THE BACTERIOPHAGE 



1. Possible Hypotheses , 309 



I. Hypothesis of a chemical principle foreign to the bacterium 309 



II. Hypothesis of a principle derived from the bacterium 311 



A. Hypothesis of an abnormal inert principle 311 



B. Hypothesis of a living abnormal principle derived from the 



bacterium 315 



C. Hypothesis of a normal autolysin 316 



D. Hypothesis of a living principle, normally present in the 



bacterium 325 



III. The Bacteriophage is a Living Being, Foreign to the Bacterium. . 326 

 Resume 327 



Chapter III 



THE NATURE OF THE BACTERIOPHAGE 



1. Statement of the Problem 329 



2. The Criteria of Life 330 



3. The Autonomy of the Bacteriophage Corpuscle 333 



