INDEX 



179 



Soil, ammonification in, 63 ; bacteria 



of, 59 ; changes due to heating, 129 ; 



nitrification in, 65 ; sampling, 60 ; 



sterilization of, 128 

 Sporangium, 109 

 Spores, 2 

 Stab cultures, 22 

 Staining methods, 34 

 Stains, capsule, 36 ; contrast, 35 ; 



flagella, 36 ; Gram's, 37 ; spore, 36 

 Starch-iodide solution, 150 

 Sterilization, 12, 115 ; by chemicals, 



115; by filtration, 121; by heat, 117; 



by steam, 118, 119; by ultra-violet 



light, 124 ; technique of, 125 

 Stimulation, 113 

 Stock cultures, 138 

 Streptococcus pyogenes, 96 

 Sugar bouillion, 24 

 Sugar gelatin, 24 



Sugars, determination of, 154, 158 

 Sulphates, reduction by bacteria, 71 



Titanium chloride, standardization of, 



159 

 Torula, 112 



Total nitrogen, determination of, 151 

 Tuberculin, 94 

 Tuberculosis, 94 

 Tyndallization, 13 

 Tyndall's method, 13 



Van Delden's solution, 27 

 Vinegar, fermentation of, 108 



Water, bacteria of, 51, 55 ; collecting 

 samples, 51 



Water blanks, 32 



Water cultures under sterile condi- 

 tions, 134 



Weights, conversion tables, 160 



Whey agar, 23 



WUt of sweet com, 89 



Wine, 107 



Yeast, 98 ; spore formation in, 99 



Ziehl-Neelson stain, 38 

 Zoogloea, 4 

 Zymase, 102 

 Zymin, 103 



