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birth, indigestion, etc., ( d ) inclosure in a hot, stuffy stable, especially 
in summer, or exposure to cold drafts or rains, (e) any change in the 
method of feeding, watering, or stabling of the animal during the test. 
Notwithstanding all these possibilities of error, the results of thou- 
sands of tests show that in less than 3 per cent of the cases tested do 
these failures actually occur. In class one the chances of error are 
decidedly reduced by the skilled veterinarian by making careful 
physical examination and diagnosing clinically these advanced cases, 
and by the injection of double or triple doses into all recently tested 
cattle, with the taking of the after temperatures beginning two hours 
following the injection and continuing hourly for twenty hours. In 
class two, errors are avoided by eliminating those cases from the test 
that are nearing parturition or are in heat, or show evidence of the 
previously mentioned diseases, or exhibit temperatures sufficiently 
high to make them unreliable for use as normal. Then, in reading 
after temperatures it is advisable not to recognize as a reaction an 
elevation of temperature less than 2° Fahrenheit and which at the 
same time must go above 103.8° F., and the temperature reaction 
must likewise have, the characteristic rainbow curve. (Those cases 
which approximate but do not reach this standard should be consid- 
ered as suspicious and held for a retest six weeks later.) In addition, 
a satisfactory tuberculin must be used, also an accurate thermometer 
and a reliable syringe in order that a sufficient dose of tuberculin may 
be given. Finally, the number of apparent errors of the tuberculin 
test will be greatly diminished if a careful post-mortem examination 
is made, giving especial attention to the lymph glands. This low per- 
centage of failures being the case, cattle owners should welcome the 
tuberculin test not only for their own interest, but for the welfare of 
the public as well. Where this method of diagnosing the disease has 
been adopted tuberculosis is gradually being eradicated, while it is 
spreading rapidly and becoming widely disseminated in those districts 
where the tuberculin test has not been employed. Without its use 
the disease can not be controlled and the cattle owner is confronted 
with serious and continuous losses; with its use the disease can be 
eradicated from the herd, a clean herd established, and the danger of 
its spread to man removed. Tuberculin may, therefore, be consid- 
ered a most beneficial discovery for the stock raiser. Strange to say, 
many of these men have been incredulous, antagonistic, or prejudiced 
against the tuberculin test by misinterpreting published statements, 
by incorrect, unsubstantiated, or exaggerated reports, and by alleged 
injurious effects to healthy cattle. 
Law has clearly stated the question when he says — 
Many stock owners still entertain an ignorant and unwarranted dread of the tuber- 
culin test. It is true that when recklessly used by ignorant and careless people it 
