198 



INDEX 



Grampus, or killer-whale, food of, 



76-7 

 Gregarines, parasites, 15 

 Grouse disease, 46 



food of, 71 



speed of, 130 

 Growing point, spiral movement of, 



117, 136 

 Growth, a characteristic of living 

 matter, 5 



influence of hormones on, 92 



influence of vitamins on, 95 



limit to, 160 

 Growth rings, absent in tropical 



Guard-cells, 53, 54 (fig. 16) 

 Guinea-pig, capillaries in muscles of, 



110 

 Gulf Stream, effect of on salinity of 



sea, 150 

 Gymnosperms, 164 



HAEMOCYANIN,m Crustacea, 108 

 Haemoglobin, 9, 36 



defined, 107 



distribution of, 107 



absent in Crustacea, 108 

 Halobates, 179 

 Hare, 8, 107 

 Heart, muscles of, 108 



pulsations of. 111 



rhythmic action of, 138-40 



diminution of beats as age ad- 

 vances, 140 

 Hedgehog, food of, 83 

 Hellebore, 55 (fig. 17) 

 Herbivorous animals, 34, 74, 79, 81 



fishes, 67 

 Hermaphroditism, 185 

 Hermit-crab, change of sex of, 186 

 Herring, 67 



fisheries, influence of moon on, 146 

 Hippopotamus, food of, 79 

 Histolysis, 17 



Holophytic types of feeding, 23 

 Holothurians (sea-cucumbers), 59 

 Holozoic type of feeding, 23 

 Hop, movement of, 118 

 Hormones, action of, 92 



derivation of name, 92 

 Horse, capillaries in muscles of, 110 

 Host, 15, 23 



House-fly, mouth of, 63 



flight of, 128 

 Houseleek, buds of, 163 

 Humidity of atmosphere, 55 

 Humus, 39, 44 

 Hydra, 13, 164 



ova of, 183 

 Hydroid, 164 



Hydrozoa, 167, 189 

 Hyena, 81 



Individuals, 20 



Insectivora, 82 

 Insects, in soil, 46 



in manure, 47 



efficient respiration of, 103, 127, 

 155 



predominance of, explained, 104 



strength of, 128 



air-breathing, 179 

 Intestinal glands, rhythmic action of, 



137 

 Intestine of man, length of, 89 

 Intussusception, 160 

 Ireland, reptiles in, 71 

 Iron, 9, 31 



in protoplasm, 41 



oxides, 43 



in haemoglobin, 107 

 Irritability of protoplasm, 12 



Jackal, 81 



Jelly-fish, Medusa, size of, 26 



food of, 58 



movement of, 123 



impart colour to sea, 151 



produced asexually, 168, 172 

 Jerboa, movement of, 128 



Kangaroo, food of, 74 



movement of, 128 

 Katabolism, 58 

 Kelp, Laminaria, 170 

 Kidneys, 100 

 Kiwi, Apteryz, egg of, 183 

 Krogh, Dr, 110 



Lacteals, 91 



Lactic acid, 131-2 

 Lamprey, 167, 190 



