442 STATE BOARD OF AGRICULTURE. 



of virus pigs treated by virus having a commou origin. We therefore 

 believe that these cultures originated, in the original virus and not in 

 an alleged normal habitat in the pig's intestine. 



CONCLUSION. 



We believe that the relation of B. cholerae sais to the porcine organ- 

 ism and to the filterable virus, and all the interrelation of these three 

 factors in the production of a swine disease should be settled. A 

 scientilic understanding of hog cholera is impossible without this solu- 

 tion. The economic problems involved in the production of the Dorset- 

 Niles serum or any other biological therapeutic agent for hog cholera, 

 and the sanitaiw police control and eradication of this disease demand 

 it. 



The writer is not interested in a controversy over the merits of the 

 different claims as to the etiologic significance of a non-cultivable, 

 virus or a microscopic, cultivable virus for hog cholera. It is only 

 wished tliat the matter may be placed beyond the stage of controversy. 



REFERENCES. 



1. Studies of agglutination reactions in hog cholera during the 

 process of serum piioduction (Preliminary). Tech. Bui. No. 3, Oct., 190J), 

 Mich. Agr. Expt. Sta. 



2, Hottinger, K. Ueber das A^erhaeltnis des B. suipestifer zur 

 Schweinepcst. Schweizer Arch. f. Tierheilk. Bd. XLVll, 1905, Hft. 

 5. Ref. Arb. a. d. Kais. Gei^und 27, 1908, p. 428. 



3. Hiss, P. H. A method for obtaining mass cultures of bacteria 

 for inoculation and for agglutination tests. Jour. Expt. Med. 1905, 

 Vol. 7, p. 223. 



4, Dammann und Stedefeder. Untersuchungen iiber Schweinepest. 

 Archiv f. wissensch. und. prakt. Tierheilk. Aug, 31, 1910, Bd. 36, 

 Heft 4-5. 



