INDEX 



NOTE. Numbers in heavy-faced type refer to pages containing illustrations as well as 

 descriptive text. 



Abdomen of insect, 319 

 Absorbing organs, in animals, 100 



of plants, 304 

 Accommodation, 259 



relation to focusing, 259 

 Acids, test for, 234 

 Adenoids, 70 

 Aerobic, 153 

 Air, in lungs, 63 



impurities in, 46 



ocean of, 40 



pressure, 59 



principal gases in, 42 



properties of, 42 



pure, 27 



reality of, 41 



relation to health, 65, 163 



relation to light, 184 



relation to soil, 301 



supply, regulation of, 193 



weight of, 59 



Air passages, diseases of, 70 

 Ammeter, 364 

 Ampere, 364 

 Anaerobic, 153 

 Anopheles, 14, 135 

 Ants, 138 



relation to food, 139 

 Arsenate of lead, 326 

 Arteries, 145 

 Astigmatism, 260 



Bacteria, 19, 59 

 aerobic, 153 

 anaerobic, 153 

 bacillus, 153 

 coccus, 153 

 conditions favorable and unfavoiable, 



119 

 culture medium, 67 



Bacteria Continued 



denitrifying, 316 



growth of, 119, 159 



relation to diseases, 160 



relation to food, 120 



relation to soil, 316 



types of, 1 60 

 Bathroom, modern, 148, 281 



flush tank, 150 

 Bedbugs, 138 



Bedroom, ideal, ventilation of, 277 

 Bees and wasps (Hymenoptera), descrip- 

 tion of, 323 



Beetles (Coleoptsra), description of, 323 

 Bell, electric, 351 

 Bifocal lens, 261 

 Birds, 328, 329 



Bleaching, relation to clothes, 233 

 Blood vessel, 145, 220 

 Body, compared to engine, 91 



composition of, 92 



poisons, 1 66 



relation to clothing, 220 



relation to food, 92, 99 



relation to heat, 221 

 Bordeaux mixture, 326 

 Bread making, 118 



yeasts in, 117 

 Breathing, 60 



necessity for, 63 



process of, 61 

 Brick, making of, 273 

 Bronchial tubes,' 60 

 Bugs (Hemiptera), description of, 323 

 Burning test, 228 

 Butterfly or moth, adult or imago, 320 



eggs, 319 



larva or caterpillar, 320 



life history of, 319 



pupa, 320 



409 



