4 
Colorado Experiment Station. 
ver for assistance in caring for the animals that were shipped there, 
and to Dr. J. C. Exline, U. S. Inspector in charge at Denver, for 
making observations. 
This report is based upon personal observations made on thirty- 
two cases and autopsies held on six. In addition to this, several 
cases have’ been seen on which no special observations were made 
and no records kept. 
HISTORY AND DISTRIBUTION. 
This disease has been known in South Park, which is a high 
mountain park, varying in altitude from nine to ten thousand feet, 
since 1889 and in all probability existed before that time. It has 
been reported from North Park, which is approximately eight thou¬ 
sand feet, on numerous occasions. The people around Divide 
(about nine thousand feet) have reported many cases. It does not 
seem to exist to any extent in the San Luis Valley, which runs in 
altitude from seven to eight thousand feet, but is frequently reported 
from the high ranges surrounding it, when the cattle pasture on 
the forest reserves during the summer. It seems then to exist in 
the mountains of Colorado from the Wyoming line on the north to 
the New Mexico line on the south. We have not personally seen 
cases at altitudes below seven thousand feet, although we have talked 
with men who believe they have, and it would seem that an occa¬ 
sional case of a similar nature might occur at any altitude. 
Thinking that other mountain states must suffer to some extent, 
we addressed letters to either the State Veterinarian, the Station 
Veterinarian, or both, of the States of Utah, Wyoming, Montana, 
Idaho, Nevada and California. We received replies from all except 
Idaho, stating that such a disease had not been brought to' their no¬ 
tice. In spite of these negative replies, we have good reason to 
believe that the disease exists in the high altitudes of some of these 
states, although it has never seemed to assume such proportions 
as to be called to the attention of the veterinary officials. 
In a conversation with Dr. John R. Mohler, Assistant Chief 
of the U. S. Bureau of Animal Industry, he expressed himself as 
having read something in Swiss literature of a similar disease. He 
has so far, unfortunately, been unable to find the article. We have 
addressed a letter to the Veterinary College at Berne, Switzerland, 
with the hope of gaining information from that source and if suc¬ 
cessful will include it in a later report. 
ECONOMIC IMPORTANCE. 
It is very difficult to estimate the cost of this disease to the 
State. During the winter of T913-IQT4 one South Park stockman 
