690 



SUBJECT INDEX 



Hayland soils, 399 



Heat conductivities, 260 



Heat shock in foundry molds, 480 



Heavy liquids, 622 



Heavy minerals, 60, 571 



Hectorite, 465 



Helena, Ark., 218 



Helicopter, use of, in military geology, 



647 

 Hematite, 56, 512, 572 

 Henderson Airfield, Guadalcanal, 650 

 Hess Creek, 265 

 Heulandite, 462 

 High-alkali cement, 443, 462 

 High plains, 413 

 High Point, N. C, 401 

 Highway cuts, 234 



Highway engineering, 127-146, 169-180 

 Highway Research Board, 111, 248, 265 

 Hillgate soils, 44 

 Histogram, 477 

 Hiwassee Reservoir, 357 

 Hoang Ho River, 122 

 Holes Dam, Wash., 452 

 Holland, 44, 208 

 Homestake gold veins, 528 

 Hong Kong, China, 297 

 Hoover Dam, 360, 367, 394, 443 

 Hopi Indian Reservation, 424 

 Horizons, soil, 41 

 Hornblende diorite, 444 

 Hot compression test, 480 

 Houma, La., 213 

 Houston, Tex., 296, 616 

 Hubnerite, 488 

 Huerfano River, Colo., 382 

 Hulah Dam, Okla., 189 

 Humble Oil & Refining Company, 561 

 Humboldt River, Nev., 412 

 Humid climate, 14 

 Humid soils, 48 

 Hummocks, 256 

 Humus, 53, 57-60 

 Hunton limestone, 626 

 Hyatt zinc mines, N. Y., 540 

 Hydrargillite, 56 

 Hydration, 55, 462, 466 



of cement, 462 



of clay minerals, 232 

 Hydraulic engineers, 403, 646 

 Hydraulic fill, 188 



Hydraulic gradient, 114 

 Hydraulic jacks in tunneling, 202 

 Hydraulic mining, 333, 337 

 Hydraulic properties of sediments, 94, 



96, 104, 108, 223 

 Hydraulic radius, 602 

 Hydrocarbons, 576, 596, 611 

 Hydrochloric acid, 622, 624 

 Hydrofluoric acid, 624 

 Hydrogen-ion concentration, 5, 24, 608, 



619 

 Hydrogen sulphide, 21, 28, 612 

 Hydrogenation of oils, 611 

 Hydrograph records, 225 

 Hydrographic Office, 662 

 Hydrology, 55, 262, 339, 403, 538, 604, 



608 

 Hydrostatic pressures, 604, 610 

 Hydrothermal processes, 537 

 Hydrotroilite, 509 

 Hydrous micas, 56, 130 

 Hydroxide, iron, 512 

 Hysteresis zone, 596 



Ice, erosion of, 7 



hardness of, 7 



in permafrost, 251-254, 264 



rate of movement of, 7 

 Ice age, 12 



Ice deposits, 7, 13, 20 

 Ice mounds, 256 

 Ice-wedge polygon, 263 

 Idaho, 237, 382, 528 

 Igneous rocks, 485 



weathering of, 5 

 Illinois, 46, 119, 122, 139, 382, 475, 481, 



560, 617 

 Illinois Geological Survey, 464 

 Illinois River, 333 

 Illite, 130, 465, 476, 608 

 Illuviation, 58 

 Ilmenite, 475, 488, 512, 572 

 Imperial Dam, 371 

 Impervious layers, 108, 187-191, 221 

 Impregnating rocks with plastic, 624 

 Impurities in aggregate, 462 

 Inclined strata, effect of, on landslides, 



238 

 Index, plastic, 99 



