I'm NoMi N().\ oi l.o( \i Skin Ri \(ii\ii'i io I> aci i kiai liLTRAirs. 

 len preparatory units intraderinally and 25 reacting units intravenously of 

 meningococcus filtrates. Appearance of reaction four hours after the intra- 

 venous injection. Pliotograph of li\ing rabbit by Mr. Harold Fowler, New 

 York. 



