INDEX 



465 



Haustoria, 68 



Hay infusion microcosm, 50-51 



Head, 130, 190; of Honey Bee, 326 



Heart, 131, 137, 148-151, 153, 163, 

 165, 172; evolution of, 365; 

 work of, 172 



Heat, animal, 15 (see Temperature) 



Hedgehog, 313, 416 



Hematochrome, 35 



Henderson, L. J., 308 



Hen's egg, 238, 253 



Hepatic artery and vein, 164, 165, 

 167 



Hepatic portal system, 150, 165, 

 167, 168 



Herbalists, 385 



Herbals, 383 



Heredity, 251; and evolution, 

 376; 'social,' 297 (see Inherit- 

 ance) 



Heritage of the individual, 261- 

 306 



Hermaphrodite, 204 



Hertwig, O., 21 



Heterospory, 106 



Heterozygote, 277, 279, 281 



Heterozygous, 276 



Hickory, 72 



Hind-brain, 186 (see Brain) 



Hippocrates, 381 



Histology, 4; history of, 398-400; 

 plant, 75-84 (see Tissue) 



History, of biology, 379-411; com- 

 parative anatomy, 392-394; 

 embryology, 401-403; genetics, 

 403-406; histology, 398-400; 

 organic evolution, 406-411; 

 physiology, 394-398; taxonomy, 

 390-392 



Holdfast, 63 



Homologous chromosome (see 

 Chromosome) 



Homologous organs, 130, 852 



Homology, serial, 353 



Homothermal, 174, 176, 312 



Homozygote, 277, 279, 281 



Homozygous, 276, 302 



Honey Bee (see Bee) 



Hoofs, 138 



Hooke, 387 



Hormone, 181, 206 (see Endo- 

 crine) 



Horns, 138 



Horse Chestnut bud, 72 



Horse, evolution, 361, 362; skele- 

 ton of leg, 352 



Host, 334 



Human, body, chemical composi- 

 tion, 11; median section, 153; 

 ear, 198; egg, 239; eye, 201; 

 kidney, 180; skeleton, 354; 

 sperm, 239 (see Man) 



Humerus, 144 



Hutton, 410 



Huxley, 30, 54,211, 261, 345, 356, 

 393, 394 



Hybrid, 272, 306 (see Heterozy- 

 gote) 



Hydra, 118-121, 157, 169, 194, 

 219, 332, 414; asexual reproduc- 

 tion, 217; discovery of, 388; 

 feeding instinct, 342; longitudi- 

 nal section, 119; nerve cell, 183; 

 receptor-effector system, 184; 

 regeneration and grafting, 221; 

 reproductive organs, 204; trans- 

 verse section, 22, 120 



Hydranth, 218; comparison with 

 medusa, 219 



Hydrochloric acid, 157 



Hydroid, 115, 117, 145; colony, 

 218; life history, 218 



I 



Iliac artery and vein, 164 

 Ilium, 144, 145, 354 



