UBIQUITY OF BACTERIOPHAGE 



431 



of barbone. Eight other tests have been made; five were comparable 

 to those cited. In three others a bacteriophage was not found; if it was 

 present it was inactive for the eight test organisms. 



Nos. 16 and 17. Swine in Cochin-China, in a barbone area. 



Nos. 18 and 19. Swine in Paris. 



Nos. 20 and 21. Swine in France, on a farm infected with avian 

 typhosis (4 other comparable results) . 



Nos. 22 and 23. Rabbits living in cages at the Pasteur Institute (4 

 other comparable findings) . 

 Nos. 24 and 25. Goats in Paris.^i^, ^21 



7. THE VIRULENCE OF THE BACTERIOPHAGE IN THE NORMAL ANIMAL 



I have attempted to discover whether the activity manifested for 

 different bacteria by a filtrate of the excreta of an animal is due to the 



