INDEX 



559 



Inferiority, conflict, nature of, 236 ; pre- 

 vention of, 236 



Influenza, symptoms of, 476 ; trans- 

 mission of, 476 



Infusoria, 521 



Inheritance, chromosome theory of, 331- 

 333; of disease, 368-369; of varia- 

 tions, 374-375 



Inoculation, smallpox, in the Orient, 420- 

 421 ; introduction into England, 421 ; 

 method of, 421 ; origin, 421 



Insecta, 524 



Insectivora, classified, 527 



Insects, the young of, 297 ; wasps, 297- 

 298 



Inspiration, definition of, 182 



Insulin, in treatment of diabetes, 199 



Intelligence quotient, definition of, 228- 

 229 



Intelligence, definition of, 227 ; measure- 

 ment of, 228-229; of students of 

 Oxford University, 357 ; relation of 

 progress in school to, 229-230, rela- 

 tion of vocations to, 230-231 



Intercellular materials, 74 



Intestine. See Large intestine, Small 

 intestine 



Intestinal gland, in relation to digestion, 

 118 



Intestinal juice, 131, 132 



Introspection, advantages of, 236 ; dis- 

 advantages of, 236 



I.Q., 228-229 



Irritability, cause of, 202-203; in 

 amoeba, 44-46 ; in animals, 202-203 ; 

 in green cell, 41 ; in Paramecium, 50- 

 51 ; in plants, 202 ; in man, 205 



Islands of Langerhans, 198 ; location of, 

 199 ; value of, 199 



Isogametes, defined, 267, 268 



Jenner, Edward, discovery of vaccina- 

 tion by, 421-422 

 Juke family, history of, 358-359 



Kallikak family, history of 359-360 

 Kanred wheat, how produced, 347 ; 



increased yield of, 351 

 Katabolism, in cell, activities, 60 ; mean- 

 ing of, 59 

 Kidneys, elimination of waste through, 



170; excretory function of, 175-176; 



position, 175 ; secretion of urine by, 



170, 175 ; structure of, 175 

 Kitasabo, cultivation of tetanus bacilli 



by, 460 

 Klebs, discovery of diphtheria bacilli by, 



450 

 Koch, discovered cause of tuberculosis, 



438-440 ; effect of his discovery, 440 ; 



experiments with guinea pigs, 439- 



440; portrait of, 437; postulates of, 

 440 ; tuberculin test prepared by, 

 446-447 



Labor, physiological division of, 6667 



Lacteals, 136-137, 166 



Lamarck, Jean de, theory of evolution, 

 371-373 



Lamarckian theory, of evolution, 371-373 



Langerhans, islands of. See Islands of 

 Langerhans 



Large intestine, 135 ; absorption from, 

 138; bacteria of, 135, 140; bacterial 

 action in, 135 ; function of, 133, 134 ; 

 divisions of , 119, 135; relation to con- 

 stipation, 135, 139 



Larynx, 178, 179 



Laveran, discoverer of malarial parasites, 

 481 



Laws, of inheritance (Mendel's), 322-330 



Lawton blackberry, berries produced 

 from, 348, 349 



Laxatives, kinds, 139-140 ; use, 139 



Layering, method of vegetative propaga- 

 tion, 260 



Lazear, work on yellow fever, 487-491 



Leaf, functions of, 70 



Learning, laws of, 223-224 



Leeuwenhoek, contribution to contro- 

 versy on origin of life, 240-241 ; im- 

 proved microscope, 19-20 



Lemuroidea, 527 



Levels of reactions, 216, 217; diagrams 

 to show, 218, 219, 220 



Life, origin of, 239245 ; ancient idea, 

 239 ; a present-day theory of, 245 



Ligaments, functions, 80-81 



Lindbergh, contribution to science, 1 



Linnaean system, of classification, 510- 

 511 



Linnaeus, Carolus, system of classifica- 

 tion by, 510-511 



Linin, in nucleus, 57 



Lipase, an enzyme, 38 ; steapsin, 131 



Lister, Sir Joseph, contribution to sur- 

 gery, 4 



Little Club wheat, improvement of, 350 



Liver, circulation through, 160-161 ; 

 function of, 132, 161 ; relation to diges- 

 tion, 118; secretion of, 132; storage 

 of sugar in, 161 



Locomotion, of amoeba, 46 ; of Parame- 

 cium, 49 



Lockjaw. See Tetanus 



Loeb, J., on artificial parthenogenesis, 

 271-272 



Loeffler, isolation of diphtheria bacilli 

 by, 450 



Lungs, flow of blood through, 160 ; in- 

 fection of. See Pneumonia and Tuber- 

 culosis ; laboratory problem on struc- 



