950 
Gunpowder, experiments. on velocity of 
shock from explosion of, 267 
Gypseous composition of rocks, 90 
Gypsum, 84, 115; beds and veins of, 487; 
absorbent power of, 299; decomposed by 
organic matter in water, 332; precipi- 
tated by calcium carbonate, 399, 400; 
found at yoleanic vents, 235; deposits of 
various geological ages—Silurian, 661, 
692, 693; Devonian, 704; Permian, 751, 
757; Triassic, 759, 765; Jurassic, 800; 
Eocene, 851; Oligocene, 859, 861; Mio- 
cene, 869; Pliocene, 870, 877 
Gypskeuper, 768 
“Gyps lacustre” and “Gyps marin” of 
Paris basin, 851, 859 
Gyracanthus, 732 
Gyroceras, 698 
Gyrodes, 832 
Gyrogonites, 856 
Gyrolepis, 763 
Hade of Faults, 316, 524 
Hadrosaurus, 811 
Hematite, 67, 116 
Hail, formation of, 329; effects of, 402 
Hakea, 870* 
Halcyornis, 840 
Haliotis, 881 
Halitherium, 873 
Halleflinta, 128 
Halonia, 728 
Halysites, 664 
Hamilton Group, 704 
Hamites, 807, 809* 
Hampshire basin, 844 
Haplophlebium, 732 
Hardness of minerals and rocks, 62,91 ; and 
softness in relation to weathering, 334 
Hare, early forms of, 868 
Harlech rocks, 654 
Harpes, 673 
Harpoceras (Ammonites), 786, 789,* 79 1* 
Harz, metamorphism in the, 578, 703 
Hastings Sand, 817 
Haughtonia, 657 
Hauyne, 78, 96 
Hawaii, volcanoes of, 211, 222, 223, 225, 
228, 231, 245, 254, 266 
Hay Fell Flags, 684 
Hazel, fossil, 868, 875 
* Head” or brick-earth, 340 
Headon Beds, 357 
Heat, effects of in expanding rocks, 284; 
sources of hypogene, 289; experiments 
in the effects of on rocks, 293; affects 
capillarity of rocks, 299; increases 
solvent power of water, 300 
Heavy Spar, 84 
Hedera, 849 
' Hedgehog, early forms of, 841 
Heersien (Systeme), 849 
Helderberg formation (lower), 692; (upper), 
TO5 
INDEX. 
- Heliolites, 668 
Helianthaster, 696 
Helicoceras, 807 
Helicotoma, 666 
Helix, 857, 866, 875, 898 
Helladotherium, 863*, 872 . 
Helvetian Stage, 868 
Hemiaspis, 664 
Hemiaster, 804 
Hemibos, 880 
Hemicosmites, 664 
Hemipedina, 773 
Hemipneustes, 804 
Hemisphere, Southern, excess of density 
in, 12, 43 
Hempstead Beds, 856 
Herculaneum, destruction of, 233 
Hesbayan mud, 887, 897, 898 
Hesperornis, 811, 812* 
Heterocetus, 866 
Heterohyus, 840 
Heterophyllt (Ammonites), 784 
Hettangien, 798 
Hexacrinus, 700 
Hexaprotodon, 880 
Hickory, fossil forms of, 804, 871 
High-water mark, 419 
Hills of circumdenudation, 924 
Hils (Conglomerat und Thon), 828 
Himalayas (see India), height of, 36; 
snow line of the, 403; ancient glaciers 
of, 901 
Himantopterus, 682 
Hipparion, 871* 
Hippotherium, 866, 876 
Hippothoa, 665 
Hippurites, 806, 807* 
Hippuritic province of the Cretaceous 
rocks of Europe, 814, 826, 830 
Hippuritide as type-fossils for Cretaceous 
rocks, 806 
Hippohyus, 880 
Hippopodium, 774, 776* 
Hippopotamodon, 880 i 
Hippopotamus, fossil, 865, 872, 891, 905 
Histioderma, 657 
Hoang-Ho, area of basin of, 444; annual 
discharge of sediment, 444 
Hoar-frost removes impurities from the 
air, 331 
Hog, first appearance of, 864 
Holaster, 804 
Holectypus, 793 
Holland, oscillations of level in, 281; 
sand-dunes of, 324; delta-formation, 389 
Holopxa, 666 
Holopella, 666 
Holoptychius, 699, 710 
Homualonotus, 664, 667, 677*, 696, 697* 
Homocamelus, 881 
Homotaxis, doctrine of, 617, 619 
Hone-stone, 122 
Hoploparia, 846 
Horizons in geological record, 635 

a 
