i6 
Journal of Agricultural Research 
Vol. VIII, No. i 
Table IX .—Summary of the tests conducted for comparative purposes with (I) the antigen 
of Besredka and (II) the antigen prepared from a bacillary emulsion and tuberculin 
precipitate 
Degree of fixation. 
Bovine serum. 
Number 
of cases. 
++++ 
'++ + 
++ 
. + 
± 
I 
II 
I 
II 
I 
II 
I 
II 
I 
II 
I 
II 
I 
II 
Group 1: 
Serums from 
animals with¬ 
out lesions of 
tuberculo sis 
£nd negative 
to the tuber- 
81 
83 
Group 2: 
Serums from 
animals show¬ 
ing arrested 
lesions of tu- 
4 
7 
16 
42.80 
66.67 
Group3: 
Serums from 
animals show¬ 
ing progres¬ 
sive lesions of 
tuberculosis... 
Group 4: 
Serums from 
animals show¬ 
ing general¬ 
ized well 
marked or ex¬ 
tensive le¬ 
sions. 
1 
I 
• 
1 
I 
Group 5 : 
Serums from 
animals show¬ 
ing acute and 
miliary le¬ 
sions of tuber¬ 
culosis . 
6 
1 
4 
1 
1 
16.35 
16.35 
Total. 
136 
3 
18 
25 
10 
99 
94 
43 -SS 
66.16 
TESTS OF HOG SERUMS 
Besides the testing of bovine serums, a limited number of tests were 
undertaken with hog serums. Most of these were obtained from abattoirs 
from hogs which on post-mortem examination revealed lesions of tuber¬ 
culosis, irrespective of the extent of the disease. A desirable number of 
apparently healthy hogs were also included in the test. No detailed 
post-mortem charts accompanied the serums, they being only marked 
“positive” or “negative.” A limited number of serums were also ob¬ 
tained from hogs which reacted to the intradermal tuberculin test and 
which on post-mortem examination proved to be affected with tubercu¬ 
losis. In all, 120 hogs were tested. 
The results of the complement-fixation test in tuberculous hogs were 
very irregular and much less reliable than in cattle. This might be 
attributed to the fact that tuberculosis in hogs as observed in meat 
inspection is limited in about 95 per cent of the infections to the lymph 
glands of the head and neck in the form of isolated foci, showing in most 
