086 
Gerber’s test for milk fat, 369 
Germicidal action of saliva, 228 
— — — gastric juice, 229 
Giblet broth, 46 
Giltay and Aberson’s solution, 67 
Glossary of terms, 105 
Glucosamines, bacterial action on, 191 
Glucose formate broth, 47 
—— agar, 49 
Glutamic acid, 186 
Glycerol in disinfection, 142 
~~ potato broth, 60 
Glycocoll, 184 
Grades on milk, 391 
— milk by bacterial count, 387 
Grading eggs, 455 
Gram positive and negative bacteria, 83 
~~ stain, Nicoll’s modification, 83 
— —, theory of, 81 
Graves’ modification of the Durham 
fermentation tube, 2 
Griess method for nitrites, 116 
Groups, bacteriological, 99 
— of bacteria in intestines, 2386 
H 
Halogens as disinfectants, 134 
Ham souring, 499 
Hanging blocks, 77 
— drops, 77, 78 ; 
Harding and Prucha’s method for bac- 
teria in cheese, 431 
Haricot decoction, 58 
Harrison’s method for bacteria in cheese, 
432 
Hay infusion, 57 
Hazen theorem, 269 
Heated milk, determination of, 371 
Hemocytometer rulings, 14 
-— chamber, 12 
Heese agar medium, 51 
— and Niedner’s agar, 50 
High-pressure steam sterilization, 122 
Hiss agar-gelatin medium, 51 
— medium, 56 
Histidine, 187 
Holt-Harris-Teague method for B. typho- 
sus in feces, 255 
INDEX 
Hot air oven sterilization, 122 
Houston’s method for isloating strepto- 
cocci from feces, 296 
Huntoon’s method for staining capsules, 
84 
Hydrogen sulphid formation, 116 
Hydrolysis of carbohydrates during 
sterilization, 44 
Hyphe, structure of, 212 
I 
Ice and typhoid fever, 339 
— cream, 434 
— — plant score card, 439 
Identification of bacteria by agglutina- 
tion, 321 
Illuminating power of the microscope, 29 
Illumination of the microscope, 31 
Incidence of tubercle bacilli in market 
butter, 427 
—_-—— milk, 414 
Incineration in sterilization, 122 
Inclination joint on the microscope, 25 
Indol from tryptophane, 244 
—, test for, 115 
Indicator solutions, 553 
Indicators of pollution, 294 
Infection of food by carriers, 5380 
Influence of salt on bacteria, 499 
Initial contamination of milk, 375 
Ynorganic disinfectants, 1383 
—— elements in organic compounds, 187 
Inspissator, 127 
Instructions for collecting water samples, 
274 
Intermittent sterilization, 127 
Interpretation of bacterial tests on milk, 
387 
—~-—~ results in water analysis, 315 
Intervals before analysis of water 
samples, 273 
Intestinal bacteria, effect of protein 
diet, 236 
— — — — water drinking, 237 
— flora, classification, 238 
Invigoration of cultures, 108 
Iodine absorption number of fats, 198 
-—— in disinfection, 134 
