623 



Homogeneous bacterial species; 168, 

 242 



Horses, intestinal bacteriophage in; 

 425 



virulences of bacteriophage in; 432 



Hydra viridis, parasitic phenomena in; 

 318 



H ion concentration, effect on adsorp- 

 tion; 289 



, effect on bacteriophagy; 43, 



69, 184, 187, 300 



, effect on plaque formation; 



88 



, effect on rate of multiplica- 

 tion; 126 



H ions, flocculation of bacteriophage 

 by; 287 



Hypotheses concerning bacteriophage; 

 309 



Immunization against avian typhosis; 

 510 



against barbone; 520 



against dysentery; 533 



with bacteriophage; 509 



Infants, appearance of bacteriophage 



in; 423 

 Infections, experimental and natural; 



509 

 Infusorial earth, adsorption by; 289 

 Ingestion of bacteriophage; 416 

 Inhibition by antibacterial sera; 400 



by antibacteriophagic sera; 392 



by metabolic products of bac- 

 teriophage; 216 



, relation to bacteriolysis; 51 



Inorganic chemicals, effect on bac- 

 teriophage; 300 

 Intestinal bacteriophage, effect of diet 

 on; 428 



in avian typhosis; 481 



in bacillary dysentery; 439 



in domestic animals; 424 



in man ; 437 



• in typhoid fever; 451 



disturbances, bacteriophage in; 



437 

 tract, bacteriophage of; 416 



Irradiation, effect on bacteriophage; 



291 

 Isolation of bacteriophage; 21, 38, 137 

 — — of pure races of bacteriophage; 156 



Janzen and Wolff method of deter- 

 mining virulence; 146 



Kabeshima hypothesis of bacterio-- 



phage; 309 

 Kaolin, adsorption of bacteriophage 



by; 289 

 Kuttner hypothesis of bacteriophage; 



313 



Lactic acid, effect on bacteriophage; 

 304 



Lead salts, effect on secondary cul- 

 tures; 190 



Leucocytes, effect of bacteriophage on; 

 408 



Leucocytic origin of bacteriophage; 

 311 ' 



Life, criteria of; 330 



, relation of bacteriophage to origin 



of; 375 



Limiting concentrations of the bac- 

 teriophage; 56 



Lipoids, effect on bacteriophage; 306 



Lisbonne and Carrere hypothesis of 

 bacteriophage; 314 



Locusts, Coccobacillus acridiorum in; 1 



Lysis, definition of; 18 



Lysol, effect on bacteriophage; 304 



Magnesium sulfate, effect on bacteri- 

 ophagy; 71 



Maitland method of determining viru- 

 lence; 148 



Mercuric chloride, adaptation of bac- 

 teriophage to; 348 



, effect on bacteriophage; 301 



Metabolic products, effect on bac- 

 teriophagy; 48 



Methyl violet, effect on bacteriophagy; 

 72 



Microscopic aspects of bacteriophagy; 

 130 



