THE BACTEEIOPHAGE IN THE HEALTHY INDIVIDUAL 235 



No. 14. A carriage horse in Paris. 



No. 15. The same animal as No. 14 (above) but tested four 

 days later. 



No. 16. A farm horse on a farm where avian typhosis was 

 present. 



No. 17. A farm horse on a farm where avian typhosis was 

 present. 



No. 18. A farm horse on a farm where avian typhosis was 

 present. 



No. 19. A race horse at Chantilly. 



No. 20. A race horse at Chantilly. 



No. 21. The same animal as No. 19 (above) but tested eight 

 days later. 



No. 22. The same animal as No. 20 (above) but tested eight 

 days later. 



No. 23. A carriage horse at Saigon. 



No. 24. A carriage horse at Saigon. 



No. 25. A saddle-horse at Nha-Trang (Annam). 



No. 26. A saddle-horse at Phantiet (Annam). 



There is no point in adding to this list; the thirty-six other 

 specimens gave entirely comparable results. 



Incidentally, horses No. 19 and No. 20, were examined to see 

 if the bacteriophage presented a virulence for various other bac- 

 teria, including the following organisms: 



1. A cocco-bacillus (?) isolated from the nasal mucus of a 

 horse in the same stable which showed the evening before an 

 elevation of temperature: 



Horse No. 19 (++), horse No. 20 (++) 



2. A cocco-bacillus isolated by Cesari from the blood of a 

 horse slaughtered in the abattoir of Vaugirard: 



Horse No. 19 (+) horse No. 20 (++). 



3. Salmonella (hog cholera): 



Horse No. 19 (++), horse No. 20 (++). 



4. B. enteritidis: Horse No. 19 (0), horse No. 20 (+). 



These results show that at a single time the bacteriophage 

 may show a virulence for a large number of bacteria. It is sig- 

 nificant that only in horses Nos. 16, 17, and 18, which lived in 

 an environment contaminated by B. gallinarum, did the intestinal 

 bacteriophage show a definite virulence for this bacterium. 



