432 



INDEX 



HABITUATION, 344 



Haeckel, 216 



Haffkine's cobra serum, 369 



Haller, 194 



Hammen, 194 



Haptophores, 352 



Hare-lip, formation of, 221 



Harrison on grafting, 406 



Hartsveker, 196 



Harvest bug, 321 



Harvey, William, 193 



Harvey's law, 28 



Hearing, development of, 162 



Heart, development of, 136, 219 



batrachian type of, 140 

 Heat. See Temperature. 

 Heat stimulation, response to, 



37 



Heliotropism, 54 

 Helotism, 301 

 Hemoglobin, 134 

 Hemolytic serum, 349 

 Hemophilia, transmission of, 



240 



Heredity, 223 



Hermaphroditism, 175, 186 

 Herpetomonas, 308 

 Hertwig, 49, 53 

 Heteromorphosis, 375 

 Heterozygous, 244 

 Histology, 92 

 Holoblastic egg, 198 

 Holophyra, 308 

 Holothurians, effect of gravity 



on, 67 



Homologous twins, 220 

 Homomorphosis, 375 

 Homonculus, 194 

 Homozygous, 244 

 Hook-worm, 310, 324 



Host, condition of receptivity, 



337 

 of parasite, 301 



Hume, David, on evolution, 256 



Huxley on classification, 280 

 criteria of life, 31 



Hyaloplasm, 94 



Hybridization, blood-relation- 

 ship and, 296 



Hybrids, Mendel's study of, 242 



Hydra, digestive apparatus of, 



122 



grafting in, 394 

 mechanical stimulation of, 45 

 nettling cells of, 124 

 regeneration in, 373 

 reproduction in, 180 

 structure of, 118 



Hydrophobia, Pasteur's treat- 

 ment of, 366 



Hydrotropism, 50 



Hydrozoa, 309 



Hymenolepis nana, 309 



Hymenoptera, 316 



Hypersensitivity, 347 



Hyperthromatosis, 101 



Hypoblast, 203 



Hypoderma, 314 



Hypopolar field, 103 



I 



ID, 235 



Idants, 235 



Idioplasm, accessory, 238 



of Nageli, 232 



plastogenic, 238 

 Immune body, 349 

 Immunity, 334 



acquired, 343 



definition of, 337 



general considerations of, 338 



natural, 340 



