22 
W. H. HARBAUGH. 
trouble to carry out the experiments as agreed upon. For 
one reason or another the other ticks sent out were not used. 
The ticks I sent Prof. Niles were taken from cattle on a 
place where there has not been a case of the disease for at 
least seventeen years; but there have been no susceptible 
cattle added to the herd since then, the herd being kept up 
by breeding the cattle raised on the place. This course was 
found necessary by the owner. Before he commenced to 
breed all his own cattle he lost every animal introduced 
among his herd; about twenty cattle were sacrificed in his 
endeavors to add fresh blood to his herd. 
Following is Prof. Niles’ report of the experiments: 
“Subject: A short-horn cow about io years old. 
Oct. io, infected with a large number of young ticks. 
4 i 
4 4 
i i 
4 » 
i t 
II 
4 4 
I 4 
i 4 
II, 
“ “ ticks. 
Temperature, 2 
P. M., 
101.2° 
12, 
9 
A. M., 
IOO° 
14 , 
infected with ticks. 
“ 2 
P. M., 
ioo.8° 
15 , 
t ( 4 4 L L 
“ 3 
101.2° 
16, 
Li 4 4 4 4 
“ 3 
ioo.8° 
17, 
“ 5 
100.8° 
19 , 
infected with ticks 
“ 5-30 
101.6° 
20, 
no more ticks placed 
on cow. Temp. 5.30 
101.2° 
21, 
“ 3 
IOI° 
23 , 
“ 3 
IOI° 
25 , 
“ 2 
103.4° 
26, 
intense diarrhoea. 
“ 9 
A. M., 
105.7° 
27, 
“ 28, 
<< 
[blood. 
[in blood, 
number of parasites 
) record of para¬ 
sites. 
one pair parasites seen in blood as mount was not properly prepared, 
temperature, 10 A. m., 106.2°, 6 p. m., 106.6°. Few parasites seen in 
blood ; mount not good. Profuse diarrhoea ; faeces covered with bile, 
temperature, 9 A. m., 105.2°, 5 p. m., 106.4 0 . Number of parasites in 
blood ; diarrhoea continues. 
29, temperature, 12 m., 104.2°, 5.30 p. m., 104°. Great number of parasites 
in blood ; bowels torpid. 
30, temperature, 8.30 a. m., 101.2 0 , 1.30 p. m., 99.2 0 . Great number of para¬ 
sites in blood ; bowels torpid. 
“ Cow killed on evening of 30th in dying condition. Post¬ 
mortem examination disclosed: Spleen greatly enlarged, 
broken down and apparently like a mass of clotted blood when 
cut into. A number of petechial spots in the left ventricle of 
the heart. Kidneys enlarged and very dark in color. Gall 
bladder greatly distended with bile as described on p. 31, 
