i 7 8 
W. H. HARBAUGH. 
a horse disease for the Bureau. Naturally, I conversed with a 
number of physicians of that section, and was informed by them 
of a serious and frequently fatal type of malaria in the human 
being, they had to contend with, called by them hemorrhagic 
malarial fever. I was struck with the similarity of the symptoms 
to those of Southern cattle fever. In fact, I know of no two 
diseases of man and the lower animals so much alike as these 
two. I wrote the particulars to a veterinarian who was an 
authority on Southern cattle fever, but he attached no import¬ 
ance to the similarity of the symptoms, considering them merely 
co-incidental. However, I determined to go deeper into the 
subject, and consequently I devoted much of my spare time to 
reading up the diseases. The more I read, the more I became 
convinced that one who learns much by reading has much to 
unlearn when he arrives to the naked truth. Of one thing I be¬ 
came convinced, however, and that was that Southern cattle 
fever was either a malarial affection or closely related to that 
class of disease. 
During the discussion of this subject I will call your atten¬ 
tion to the symptoms, post mortem lesions, history, etc., of 
hemorrhagic malarial fever as compared with Southern cattle 
fever, so that you will comprehend the grounds on which I 
based my opinion. You must remember that the protozoa— 
the micro-parasite—had not been discovered in the red blood 
corpuscles of cattle affected with Texas fever at the time of which 
I speak, and when the discovery was announced, some years 
later, it only confirmed me in my opinion as to the nature of the 
disease. 
I must mention that many of the physicians who have ex¬ 
perience with hemorrhagic malarial fever, considered it a new 
disease ; one of them told me he treated the first case that ever 
appeared in that section in 1866. But another physician claimed 
that it was not a new disease, and to prove it, he referred to 
some records in a quaker meeting house in Perquimans Co., N. 
C., as evidence that there were cases of it in that county at least 
fifty years before 1866. He said that while it was called yellow 
