CONTROL OF HOG CHOLERA. Le 
County, Kans., and Renville County, Minn., there was a marked 
reduction of losses, both absolute and relative, immediately follow- 
ing the beginning of the control work, and that the average number 
lost in each experimental county in comparison with the average loss 
in neighboring counties was reduced from somewhat more than an 
equal number in 1913 to less than one-seventh in 1915. 
Furthermore, it is important:to note that Tables 3 and 4 both 
show that the work did not in any way injure the business of hog 
raising, but on the contrary seems to have aided it greatly. The 
very large increase in the number of hogs raised in the experimental 
counties, as compared with a languishing industry in the surrounding 
counties, is one of the most encouraging indications furnished by 
the data. 
It will be remembered that the experimental work was based prin- 
cipally upon (1) an educational campaign, designed to stimulate the 
interest and secure the cooperation of farmers, and (2) the prompt 
treatment of infected herds with serum. This mode of procedure 
resulted in greatly increased hog production and greatly reduced mor- 
tality from cholera. It seems reasonable to ascribe the increase in 
hog production to the educational work, and the reduced losses from 
disease to the use of anti-hog-cholera serum. Table 5 summarizes the 
results following the use of serum in infected herds. 
TABLE 5.—Results of treatment in infected herds during 1913, 1914, and 1915. 
Hogs 
Condition of hogs and method of treatment. reatcal Hogs died. 
Hogs sick. when treated: Number. | Number. | Per cent. 
SUM TATE GUS. eames: Hr PER eene ae GO cok toe eerie Taal eee ete A 2, 448 713 29. 
SERUM OLEM en eae = tne CRM es Sen TES ee ae ae 83, 099 23, 990 28.8 
MRotalisickahoesiineated ss kes Meet ee sce Mas cco shs deve sbastaacseueck 85, 547 24,703 28.8 
Hogs apparently well when treated: 
DUTT AMEOUSS: Pewee whee kek SEE. SEAT e Tse eat ee ae 81, 289 3,070 Be 7 
SIGUE STE SORE o> SSS ESB Ut CBS EL DBS ee ee See ea on Se 67, 300 3,063 4.5 
Motalihealimy hozsitreated 4s fe SIGs eas ndeeenb esdecne eb eeek cee. 148, 589 6,183 4.1 
IG fia OES) REBUG -S cocogsiaosdiosce wbemoonsenoussoneeaeeeecorcccccase 234,136 | 30,836 13.1 
Table 5, which shows that only 13.1 per cent of 234,136 hogs treated 
in infected herds were lost, seems to demonstrate clearly that potent 
serum is effective in preventing losses from cholera and that the re- 
duced losses in the experimental counties are to be ascribed directly 
to the use of the serum. 
THE COMBATING OF HOG CHOLERA. 
There are two facts which stand out clearly with respect to hog 
cholera. First, eradication or total extirpation of the disease in the 
United States at this time is impracticable. Second, though eradica- 
tion is impossible, it is entirely practicable in large part to eliminate, 
