so 
.TAMES LAW. 
Our difference is one of degree , not of kind. 
I think Dr. Gadsden will agree with us further that certain 
conditions favor the retention of virulum and that certain other 
conditions favor its destruction. He will agree, for example, that 
the following agencies are inimical to the germ : heat and moist- 
nre, an acid environment, free exposure to air, to light and to 
electrical changes. He will agree that the following will favor 
its prolonged vitality: desiccation, exclusion of light and air, a 
neutral environment, and the absence of electrical storms. He 
will allow further that if the carefully garnered virus is kept cool 
it will for a length of time retain its power of producing the 
specific inflammation in the part of the bovine animal inocu¬ 
lated. • 
We agree then that the virus does not lose all power the 
moment it leaves the living body, and that under favorable con¬ 
ditions it will preserve its virulence longer than in other and 
unfavorable conditions. Neither he nor we can say exactly how 
long its virulence is retained in any particular case. Occasionally 
the survival of virulence is unpleasantly demonstrated by the re¬ 
appearance of the disease in animals placed in an infected stable. 
The course of wisdom, therefore, is to make quite sure and disin¬ 
fect all infected premises. I appeal with confidence to our record 
in Chicago in justification of this course and challenge comparison 
with the records of Great Britain, where infection from buildings 
is to a certain extent denied. 
As the infection in Australasia and South Africa is carried 
into new herds by inoculation, and as in New York we find cases 
of disease in large herds in which inoculation is universal, we are 
compelled to class inoculation and infected stables as among the 
fruitful causes of the maintenance of the lung plague. No country 
that practices the one and neglects the disinfection of the other, 
succeeds in a complete eradication of the disease. 
Dr. Gadsden nobly endorses our work in the extinction of the 
infected herd. Let him hold up our hands also in the matter of 
disinfection of all infected things, and he can contribute materially 
to the speedy and complete extirpation of the plague. 
