QUALITATIVE BACTERIOLOGICAL ANALYSIS. 169 



to contrast the action of anti-typhoid serum on these organisms 

 and the B. typhosus. 



NOTE. The sign + indicates agglutination with deposit and clearing of the fluid. 

 The sign + indicates agglutination without deposit. 

 The sign indicates the absence of all reaction. 



Van de Velde's experiments on the value of agglutination in 



