628 



INDEX 



Typhoid-bacteriophage, formation of 



ultrabacteria with; 226 



in domestic animals; 425 



in man; 438 



in stock cultures; 11 



in typhoid fever; 451 



in water; 436 



, persistence of virulences in; 174 



, plaque formation by; 79 



, pure races of; 156 



, rate of multiplication of; 124 



, specificity of; 168 



, temperature limits of; 59 



therapy of typhoid fever; 549 



, virulence acquisition by; 176 



, virulence attenuation of; 165 



, virulences of; 248, 334, 352 



, volatility of; 280 



Typhoid fever, bacteriophage in; 451 

 , bacteriophage in blood in; 



470 

 , bacteriophage races from; 



248 

 , bacteriophage therapy of; 



549 

 Typhus fever, bacteriophage in; 257, 



485 



Ubiquity of bacteriophage; 37, 416 



Ultrabacteria, occurrence of; 226 



of B. typhosus; 478 



Ultrafilters, denitrification of; 30 



, preparation of; 26 



, sterilization of; 32 



Ultrafiltration, methods of; 24 



of bacteriophage; 274 



Ultrapure bacterial cultures; 207 



Ultrasterile, definition; 19 



Ultraviolet rays, effect on bacterio- 

 phage; 291 



Unicity of bacteriophage; 358 



Urine, bacteriophage in; 37, 251, 257, 

 484 



, effect on bacteriophagy; 71 



Vaccinated medium, effect on bacteri- 

 ophagy; 127 

 Vaccinia, bacteriophage in; 16 



Vaccinia, Twort phenomenon; 13 

 Variability in bacteriophage virulence; 



137, 159 



of bacteriophage; 333, 350 



Variation in activity of antisera; 387 



in colony resistance; 207 



in mixed cultures; 210 



Vibrio cholerae, action of river water 



on; 8 



, agglutinability of; 264 



cultures, bacteriophage from; 10, 



261 

 , fixation of bacteriophage to; 



105 



, heterogeneity of; 261 



Virulence, acquisition of; 175 



, attenuation by antiseptics; 168 



, attenuation by time; 166 



, definition of; 141 



, determination of; 141 



determination, Appelmans 



method; 142 

 -, Beckerich and Hauduroy 



method; 145 



, d'Herelle method; 150 



, Janzen and Wolff method; 



146 



, Maitland method; 148 



, Otto and Munter method; 



147 

 , Pfreimbter, Sell and Pis- 



torius method; 147 

 , successive dilution method; 



142 

 — — , effect of resistant bacteria on; 



196 



, expression of; 141 



, expression of degrees of; 154 



inactivation by antisera; 393 



, increase in; 160 



of bacteriophage and colony type; 



208 

 of bacteriophage and sj^mptoms 



of dysentery; 440 

 of bacteriophage in typhoid fever; 



452 



, persistence of; 171 



range of bacteriophage; 168 



