INDEX 



Acetic acid, sugar changed to, 



61 



Acid, butyric, 62 

 Acids as preservatives, 72 

 Acquired immunity, 94, 134 

 Agar for dust gardens, 10 

 Alcoholic fermentation, 114 

 Alexines, 93 

 Animalcules, 109 

 Antiseptics, 65 

 Antitoxin, 94, 137-144 



diphtheria, 95, 138 

 Artificial immunity, 94, 136 



Bacteria, 16-32 

 as scavengers, 48 

 classed as plants, 112 

 definition of, 16 

 disease producing, 75 

 effect of cold on, 90 

 excretions of, 18 

 experiments with, 64 

 food of, 20 

 forms of, 1 7 

 growth of, 22 

 harmful, 63 

 in cheese making, 60 

 in coarse meals, 45 

 in "eyes" of potato, 45 

 in ice, 85 

 in milk, 14 

 in school rooms, 107 

 liquefying, 74 

 method of study of, 112 



natural home of, 30 

 nitrifying, 51 

 on dust particles, 97 

 secretions of, 31 

 size of, 23 

 structure of, 17 

 useful, 47 

 with flagella, 27 

 work of. 47, 54 

 Bacteriology, history of, 109- 



H3 



lessons for children, 124 

 Barriers of the body, 129 

 Bed-making, 102 

 Blood poisoning, 91 

 Body, barriers of the, 129 

 Boiling clothes, necessity for, 



3 

 Bread, baking, 45 * 



leavened, 6 



Breeding ground for germs, 77 

 Brushing clothing, 106 

 Burn infected material, 116 

 Burning sweepings, 104 

 Butter bacteria, 55 



bad flavors in, 58 



making, 55 

 Butyric acid, 62 



Canned goods, 70 

 Carelessness, criminal, 83 

 Care of discharges in disease, 79 



of plumbing, 106 



of refrigerator, 29 



