VACCINE-THERAPY 



159 



the trachea — a short, narrow bacillus, appearing singly, 

 sometimes in pairs, motile, and aerobic. 



On agar plates, after twenty-four hours' inoculation at 

 37° C, small colonies appeared slightly raised and trans- 

 lucent ; after forty-eight hours they increased in size, were 

 curved and amorphous, and in a week the edges undulated, 

 and showed a grumose centre. 



On potato it grew with a characteristic dark brown colour. 



On litmus milk, after seventy-two hours, it grew, giving 

 the upper half a bright blue colour, and in five days the 

 whole tube was coloured. 



Ferry also found the serum taken from distemper dogs 

 always agglutinated this bacillus. To this organism he 

 gave the name Bacillus bronchosepticus. 



M'Gowan, working independently of Ferry, isolated from 

 distemper subjects what appears to be the same bacillus. 

 M'Gowan believes the nasal mucosae is the primary seat 

 of development of the B. bronchosepticus, while Ferry is of 

 opinion it settles on the tracheal mucous membrane at the 

 outset. Torry and Hake also agree with Ferry on this point. 



These two latter workers, in addition, give an interesting- 

 table of the relative frequency of the B. bronchosepticus in the 

 various organs and fluids of dogs suffering from distemper. 



