742 
WM. PETRIE. 
reasonably explained by postulating the presence in the organ¬ 
ism of a toxic substance, preferably one capable of causing both 
acute and chronic changes. 
In this study of the lesions found in azoturia, pathological 
changes have been found which merit further study, and it is 
my intention at some later date to carry out this investigation 
in more detail. Experiments upon animals have been begun, 
but the material at hand from that source is not sufficient to be 
reported at present, and is also reserved for later publication. 
The table formulated by Dr. Balch gives the result of the 
chemical examinations made by him, the heavier lines showing 
those cases in which the larger amount of lead was found. 
The treatment that has been so favorable in these cases of 
late, the iodide of potass, is not a digression from the object 
of this paper, but in my opinion helps to sustain the theory of 
Antiseptic Therapeutics. 
Works referred to : Finlay Dun’s “ Veterinary Medicines.” 
Veterinary Record. Medical Record. American Veterinary 
Review. “ Pathogenic Bacteria,” McFarland. “ Practical 
Therapeutics,” Hair. 
CONTAGIOUS CONJUNCTIVITIS IN CATTLE. 
By Wm. Petrie, V. S., Wheeling, W. Va. 
A new disease. (?) We hear of new diseases occasionally, 
but usually on investigation find it to be some well known dis¬ 
ease that may not be common in the section from which the 
report comes. In this case I believe we have a new disease. 
My experience with it has been limited. Others may be famil¬ 
iar with it, but so far I have seen very little printed about it. I 
will report my knowledge of it that it may be discussed and 
that others may not be entirely off their guard when they see 
the first case. 
After seeing my first case I wrote Dr. D. E. Salmon, Chief 
of the Bureau of Animal Industry, who kindly informed me that 
the disease had been known about two years, and also gave a 
