TREATING INFECTIOUS MAMMITIS IN THE COW. 
15 
toxin exerts no appreciable effect upon infectious main- 
initis. 
Just as unsuccessful was the application of argentum col- 
loidale, which recently has been highly recommended as a 
general disinfecting agent. 50 grams of a one per cent, watery 
solution of this preparation were injected into the jugular vein. 
The pregnant animal bore this imposition very well. During the 
next few days the streptococci appeared somewhat diminished, 
but the purulent condition of the udder secretion remained un¬ 
changed. 
Better results followed the use of silver citrate (itrolj in the 
form of an ointment (2 parts with 10 parts of camphor and 88 
parts lard). 
After rubbing this ointment for eight days upon the skin of 
the four affected quarters of an eight-year-old cow, the secretion 
cleared and the streptococci and purulent accumulation dis¬ 
appeared. After eight days more the secretion was again normal, 
but very sparse. The udder took on a violet color, which was 
soon lost. A skin eruption did not occur. Further observations 
were discontinued. 
It is apparent that itrol has some effect, for rubbing with 20 
per cent, camphor ointment without the itrol failed to produce 
the effect. 
Since these recent remedies had put forth nothing of im¬ 
portance, a trial was made once more of the action of counter- 
irritants. It was shown that a strong and somewhat protracted 
rubbing with cantharides ointment would each time bring about 
either recovery or decided improvement. 
But in the largest number of cases, especially when the 
udder secretion consisted almost exclusively of pus and serum, 
the milk secretion remained in abeyance. The pus and strep¬ 
tococci disappeared, the disease appeared cured, but the milk 
production either was entirely suspended or shrank to a few 
hundred cm. per day. Therefore the practical economic success 
was wanting. 
There is no doubt that the poison elaborated by the strep- 
