TREATMENT OF SWINE DISEASES. 
855 
mals to be subjected to the tuberculin test, and to see that all 
such animals giving indications of tuberculosis are slaughtered. 
No indemnity shall be paid by the State to the owners for any 
tuberculosis cattle that have been brought into the State, after 
the passage of this act, without a certificate of having success¬ 
fully stood the tuberculin test. 
Sec. 4. Any person or persons violating this act shall be 
guilty of a misdemeanor and, on conviction thereof, shall be 
punished by a fine of not less than twenty-five dollars nor more 
than two hundred dollars for every such offence, or by imprison¬ 
ment for not less than one month nor more than six months or 
by both such fine and imprisonment, and for a second offence 
by an imprisonment for not less than six months and r.ot more 
than one year. 
Sec. 5. This act shall take effect immediately. 
\_From the Breeder's Gazette. 
TREATMENT OF SWINE DISEASES. 
By D. E. Salmon, D. V. M., Chief of the Bureau of Animal Industry. 
It has long been known that when persons or animals have 
suffered from an attack of contagious disease and recovered they 
resist that particular contagion for the remainder of their lives, 
even though they are exposed to it. There are exceptions to 
this rule, but they are not sufficiently numerous to affect the 
principle. The animals which have recovered from such a 
disease and which consequently have the power to resist it are 
said to be immune ; those which have not had an attack but 
which are liable to be affected when exposed are said to be 
susceptible. 
The subject of immunity has received many years of patient 
study from the ablest scientists in the world, because it has 
been clear that a thorough knowledge of this condition would 
be a long step toward the control of the greater part of the con¬ 
tagious diseases. This study has shown that there are different 
degrees of immunity, and that when an animal has had an attack 
of a contagious disease and recovered, although it is immune to 
a small dose of that contagion, if the dose is sufficiently in¬ 
creased it will have a second attack of the same disease. When 
we say an animal is immune, therefore, we ordinarily mean that 
it is capable of resisting the quantity of contagion which is 
liable to penetrate into its body under the usual conditions of 
life. 
