638 STATE BOARD OF AGRICULTURE. 



6. Before one undertakes experiments to induce abortion in cattle, 

 swine, sheep, etc., or to determine the efficacy of various prophylactic agents 

 such as anti-serums, vaccines and chemicals, it is fundamental that the 

 virulence of the strain of Bad. abortus employed should be determined by 

 such means as guinea-pig inoculations. 



BIBLIOGRAPHY 



1. Fabyan, M. A contribution to the pathogenesis of 5ad. aborfws, Bang, 

 1912, Jour. Medical Research, Vol. 26, P. 441. 



2. McFarland, Joseph. The nephelometer, Jour. Amer. Med. Assoc, 

 1907, Vol. 49, No. 14, P. 1176. 



3. Feusier, M. S., and Meyer, K. F. Principles in serologic groupings of 

 B. abortus and B. melitensis. Corrulation between absorption and agglutina- 

 tion tests: Studies on the genus Brucella, Nov. Gen. II, 1920. Jour. Infec- 

 tious Disease, Vol. 27, No. 3, P. 185. 



