DOWNS: BACILLUS TYPHOSUS. 



159 



TABLE V. — Absorption testa with Immune sera. 



Absorbing 

 antigen. 



Sera used. 



12 



27 



20. 

 21. 

 23. 

 24. 

 25. 

 26. 

 27. 



10 

 11. 

 12. 

 13. 

 14. 

 15. 

 16. 

 17. 

 19. 

 2 



+ 

 + 



+ 

 + 



+ 

 + 

 =fc 



+ 



+ 



+ 



+ 



+ 



+ 



+ 



+ 

 + 



+ 

 + 

 + 

 + 

 + 

 + 

 + 

 + 



+ 

 + 

 + 

 + 

 + 

 + 

 + 

 + 

 + 

 + 



+ 



+ 



+ 



+ 

 + 



+ 

 + 

 + 



+ 

 + 

 + 

 + 

 + 

 + 

 + 

 + 

 + 

 + 

 + 



+ 

 + 

 + 

 + 

 + 

 + 

 + 



+ Absorption 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 shown by these organisms could not be correlated with their 

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

 as with Weiss' (2). 



No. 5 was found to be entirely inagglutinable by any 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 



