CONTENTS XI 



Chapter V 



RESISTANCE OF THE BACTERIA 



1. Secondary Cultures 182 



2. The Origin of Secondary Cultures : 188 



3. Variability in Acquired Resistance 191 



4. The Acquisition of Resistance 194 



5. The Behavior of the Bacteriophage in Secondary Cultures 196 



6. The Loss of Resistance 203 



7. The Bacteria of Secondary Cultures 206 



8. Mixed Cultures 208 



9. The Cause of Secondary Cultures 215 



10. The Resistant Bacterium 217 



11. Ultrabacteria 226 



12. Natural Mixed Cultures 230 



13. The Purification of Natural Mixed Cultures 236 



14. Isolation of the Bacteriophage from Naturally Mixed Cultures 237 



R4sum6 238 



Chapter VI 



SPECIES OF BACTERIA SUSCEPTIBLE TO BACTERIOPHAGY 



1 . Homogeneous Species 242 



1. B. dysenteriae Shiga 242 



2. B. dysenteriae Pliss 243 



3. B. dysenteriae Flexner 244 



4. Pseudo-dysentery organisms 244 



5. Bacilli of fowl typhoid 245 



6. Pasteurella bovis 246 



7. B. pestis 247 



2. Heterogeneous Species 248 



1 . B. typhosus 248 



2. B. paratyphosus A 251 



3. B. paratyphosus B 254 



4. B. suipest'ifer 254 



5. B. enteritidis 254 



6. B. txjphi-murium 254 



7. B. coll 255 



8. The Pneumobacillus of Friedlander 256 



9. The Bacillus of Flacherie 256 



10. B. proteus 257 



11. The Bacillus of Swine Fever 258 



12. B. diphtheriae 258 



13. Nodule Bacteria of Plants 259 



14. B. suhtilis 261 



15. Vibrio cholerae 261 



16. The Staphylococci 264 



