THE HORSE AS A PRODUCER OF ANTITOXINES. 
391 
Fourth .—The reports and collections of statistics show 
that a large proportion of cases of tuberculosis in human 
beings occur in people who have recently moved into houses 
previously occupied by consumptives. This points to the 
direction that should be taken by sanitarians for measures 
looking to the prevention of tuberculosis in human beings. 
The same holds good in cattle. In the barns lie the greatest 
danger, and in pure air, sunlight, cleanliness and disinfection 
we have our sheet-anchors in the prevention of tuberculosis 
in dairv cattle. 
And, in conclusion, it is the opinion of many practitioners 
in Massachusetts that frequent and careful physical examina¬ 
tion with the use of tuberculin in suspicious cases, along 
with the thorough disinfection and renovation of infected 
premises, with greater attention to cleanliness and improved 
hygienic conditions would give better results and do more 
permanent good, besides being more practical and more 
economical than the wholesale compulsory use of tuberculin, 
and the total destruction of all animals that react to the test. 
Respectfully presented, 
John M. Parker, 
Assist. State Secretary. 
THE HORSE AS A PRODUCER OF ANTITOXINES, 
By Olof Schwarzkopf, V.M.D. 
A Paper Read before the U.S.V.M.A., at Des Moines, Iowa. 
Gentlemen : At a time when we hear so much of the 
coming “ horseless age,” when the praise is sung of the “ silent 
steed” and the horseless carriage parades our streets, then 
even the calm among us are joyous to see the horse once 
more in a new field of utility. Of the many usages to which 
the horse has been put by men for thousands of years, none 
has ever been loftier than its recent employment as a pro¬ 
ducer of antitoxines for some of the most dreaded of human 
diseases. 
It will be known to you that the preparation of antitoxines 
is based upon the discoveries of Behring, who proved “ that 
