324 J. HOWAED MUELLER 



meat infusion, and charcoal decolorization of heart infusion. 

 There is every reason to beUeve that there may be several indi- 

 \adual factors faUing into each of these two groups. 



REFERENCES 



Armand-Delille, Mater, Schabffer, and Terroine 1913 Jour, de physiol. 



et pathol. gen., 16, 797. 

 DoRTLAND 1916 Jour. Bact., 1, 146. 

 Koser and Rettger 1919 Jour. Infec. Dis., 24, 301. 

 Long 1919 Amer. Rev. Tuberculosis, 3, S6. 

 Mueller 1920 Proc. See. Exper. Biol, and Med., 18, 14 and 225. 



