592 INDEX 
Wine medium, 57 X-ray fluorescence, bactericidal prop- 
Winogradski’s medium for nitrite for- erties, 129 
mation, 67 y 
Winterberg method for fecal bacteria, 247 
Working distance of the microscope, 30 
Wolfthugel’s counting apparatus, 9 
Wording reports on water analysis, 317 
Wort gelatin, 56 
Wright’s stain, preparation, 88 
— anaerobic method, 18 Z 
~— procedure for staining blood films, 87 Zichl-Niehlsen method 
Yeast foods, 216 
—, genera of true, 214 
~~ in bread making, 222 
— in feces, 258 
Yeasts, classification of, 218 
of acid fast 
staining, 87 
x Zinc chloride in disinfection, 139 
Xantho-proteic reaction, 191 | Zinsser’s anaerobic method, 19 
