DOWXS: BACILLUS TYPHOSUS. 



159 



TABLE V. — Absorption tests with Immune sera. 



Sera tised. 



Abeorbing 

 antigen. 



13 20 



1. 



4. 



6. 



7. 



8. 

 20. 

 21. 

 23. 

 24. 

 25. 

 26. 

 27. 



9. 

 10. 

 11. 

 12. 

 13. 

 14. 

 15 



17. 

 19. 



+ 



+ 



+ 

 + 



+ 

 + 



+ 

 + 



— + 



-r 

 + 



+ + 



+ 

 - + 



— - ' + 



+ I + 



+ + 



+ + 



+ 

 + 

 + 

 + 

 + 

 + 

 + 

 + 

 + 

 + 

 + 

 + 



+ 

 + 



+ 



+ 

 + 

 + 

 + — 



+ .\b6orption complete. 



=^ -Absorption Incomplete but reduction of titre. 



— No absorption. 



sorption tests show a more striking difference between the two or- 

 ganisms in group III and the other groups. The antigenic differ- 

 ences sho'^Ti by these organisms could not be correlated with their 

 age as with Hooker's (9) organisms, nor with cultural differences 

 as with Weiss' (.2). 



Xo. 5 was found to be entirely inagglutinable by anj^ of the sera 

 used. Serum prepared from this organism agglutinated only the 

 homologous organism. It did not absorb any of the agglutinins 

 from the sera prepared from other organisms, nor were its agglutin- 

 ins absorbed by other organisms. These facts, in connection with 

 the somewhat irregular carbohydrate reactions and the atypical 



