470 



INDEX 



Human inheritance, 335, 336, 337, 



33S. 339 

 Human intestine, 33, 159, 160, 161, 



162-164 

 Human kidney, 188, i8g 

 Human lung, 33, 170-/72 

 Human malaria, 74, js 

 Human muscle cells, 2.41 

 Human nerve cells, 295 

 Human olfactory epithelium, 224 

 Human ovary, 200 

 Human ovum, 794, 200 

 Human placenta, 2jj, 2y8, 279, 280 

 Human protoplasm, ig 

 Human regeneration, 296 

 Human reproductive system, female, 



200, 201 

 Human reproductive system, male, 799 

 Human respiratory system, 92, 170, 171, 



772 

 Human segmentation, 140, 221 

 Human skeleton, 749-152 

 Human skin, 145, 746, 190 

 Human skull, 749, 757 

 Human spermatozoa, 794 

 Human sympathetic nervous system, 



276, 218, 220 

 Human tapeworm, 704, 364 

 Human taste buds, 224 

 Human testis, 799 

 Human tooth, 155, 756 

 Human uterus, 200 

 Human visceral pouches, 27^ 

 Humerus, 749 

 Hunger, 161 

 Hydra, 91, 92, 707, 133, 258, 266, 286, 



368, 369, 370 

 Hydranth, 702, 259 

 Hydrochloric acid, 13, 24, 157 

 Hydrogen, 7-13, 24 

 Hydrogen ions, 24 

 Hydroid, loi, 702, 259, 260 

 Hydroid, life cycle of, 260 

 Hydroid, Obelia, 702, 260 

 Hydrolysis, 12, 162 

 Hydrostatic pressure, 35 

 Hydrotropism, 375 

 Hydrozoa, loi, 702, 258, 259, 260 



Hymenoptera, 3,59-361 



Hyoid, 749 



Hypertonic solution, 36, 37, 263 



Hypochilidae, 414 



Hypoglossal nerve, 223 



Hypotonic solution, 36, 263 



Hypotrichia, 64 



Ichneumon fly, 262 



Ichthyosauria, 403 



Ileo-coelic valve, 159 



Ileum, 159, 760 



Immunity, 83-86 



Inbreeding, 340 



Incomplete metamorphosis, 358 



Incus, 231 



Indeterminism, 429 



Individual, 50 



Individual adaptations, 347 



Individual modifications, 366 



Inductive logic, 427 



Infusoria, 64, 65, 67, 71, 74, 98, 99 



Inhalation, 172 



Inheritable characters, 219 



Inheritance, 53 



Inheritance of acquired characters. 



Inheritance of curled hair, 337 



Inner ear, 230, 231, 232, 233 



Insect eye, 22^ 



Insect respiratory system, 765 



Insecta, J13, 114, 123, 124, 125, 



I97> 357- ^^^ ^^■^<^ Insects. 

 Insectivora, 121 

 Insects, 112, 113, 123, 167, 168, 



223, 262, 263, 371, 384, 385, 40 

 Instincts, 370 

 Insulin, 205, 208 

 Intelligence, 371 

 Intensity gradients, 379 

 Intermittent sterilization, 87 

 Internal fertilization, 193 

 Internal secretions, 244 

 Interstitial cells, 206, 335 

 Intestinal juice, 163 

 Intracellular digestion, 57, 132 

 Invertase, 164 

 Invertebrate nervous systems, 213, 



339 



167,, 



185. 



214 



