INDEX 
Prevalence of dust, i 
Production of lactic acid, 14 
Products of fermentation, 115 
of yeast growth, 40 
Protoplasm, 17 
Pus, formation of, 90 
Putrefaction, 12 
Rabies, 148 
Refrigerator, care of, 29 
Relations of bacteria to oxy¬ 
gen, 24 
Removing dust, 104 
Reproduction of bacteria, 20 
of mold, 33 
Resistance of body to germs, 
86 
of spores, 28 
Ripening cheese, 58 
Roquefort cheese, 59 
Rotation of crops, 53 
Rules for dusting, 104 
Safeguards of the body against 
disease, 12 7-151 
Salt as a preservative, 72 
Sanitary cleanness, 108 
Sanitation, 96-108 
personal responsibility for, 
108 
Scavengers, bacteria as, 48 
School rooms, cleaning, 107 
Secretions of bacteria, 31 
Settling of bacteria and molds, 
98 
Sewage contamination, 82 
Shape of bacteria, 17 
169 
Size of bacteria, 23 
of yeast, 39 
Soil for dust-gardens, 8, 13 
Soiled articles, disintect, 79 
Solid cultures, 111 
Source of dust, 3 
Sources of infection, 86 
Souring of milk, 13 
Specific germs of diseases, 76 
Spoiling, 71 
Spontaneous generation of 
life, 109 
Spores, 116 
mold, 35 
of bacteria, 27 
of yeast, 39 
resistance of, 28 
Starters, 57 
Sterilization, 115 
intermittent, 65. 116 
Structure of bacteria, 17 
of yeast, 39 
Sugar as a preservative, 70" 
changed to acetic acid, 61 
Summary, 113 
of terms, 114 
Sunlight, effect on disease 
germs, 26 
Sunshine as a disinfectant, 25 
Sweeping, 97 
dust-gardens planted after, 
98 
Sweepings, burning, 104 
Symptoms of poisoning, 92 
Temperature for yeast growth, 
41 
