'300 INDEX. 



Viticulosus, M., 77 

 Volutans, Sp. ; 80 



WELLS, bacterial contents of, 29 

 Widal, procedures for agglutination test, 180 

 Winogradsky, experiments on nitrification, 83 

 Wright, method of performing agglutination test, 181 



YELLOW bacillus, 64 



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