686 



SUBJECT INDEX 



Effective grain size Dio, 196, 201 



Effective permeability, 581 



Effective porosity, 586, 617 



E-K Creek, Wyo., 411 



El Paso, Tex., 420 



El Roble Reservoir, 599 



Elastic properties of soils, 95, 109, 155, 264 



Elasticity, of aggregate, 439, 460 



of foundations, 149 

 Electric charge on particles, 55, 234 

 Electric double layer, 110 

 Electric impulses, 109 

 Electric logs, 81, 562-566 

 Electric well surveys, 81 

 Electrical conductivity, relation of, to 



geophysics, 79, 80, 85 

 Electrical resistivity, 128, 130, 140, 145, 



563 

 Electrical self-potential, 85 

 Electrode polarization, 549 

 Electrolytes, 57, 465, 468, 509 

 Electromagnetic methods, 88 

 Electron micrography, 235, 622 

 Electronic equipment, in oceanography, 



661 

 Electro-osmosis, 201, 242 

 Electrostatic intensity, 572 

 Elephant Butte, N. M., 324, 382, 387, 



393 

 Elevated temperature in foundry sands, 



480 

 Elutriation tests, 100 

 Embankments, 96, 187, 191, 241 

 Emerald Bay, Calif., 283 

 Emeralds, 489 

 Emery, 489 



Emission spectrograph, 622 

 Emmersberg tunnel, Switzerland, 204 

 Enamel sand, 490 

 Energy, 9, 10, 17, 24, 659 

 Energy balance, 283 

 Enid, Miss., 220 

 Engine sand, 489 



Engineering, geophysical research in, 87 

 in permafrost areas, 257 

 of highways, 127-146 

 problems of, in the Alluvial Valley, 219 

 involving strength of sediments, 126 

 Engineering News-Record, 243 

 Engineering structures, 219 

 Engineers School, Fort Belvoir, Va., 247 



England, 44, 233, 237 



Environment, 9, 17 



Eocene, 122, 199, 475, 514 



Eolian deposits, 12, 129, 131, 451, 481 



Epidote, 572 



Equilibrium, of earth masses, 231 



profile of, in sea, 23 

 Erosion, 5, 62, 211, 383, 407 



in Mississippi River, 211 



in permafrost areas, 255 



rate of, 171, 399 



relation of, to precipitation, 388 

 to sediment control, 398 



stream-bank, 319 



structures for prevention of, 428 

 Erosion channel, 407 

 Erratics, 640 



Eskers, as source of gravel, 120, 646 

 Etching techniques, in study of lime- 

 stone, 622 

 Eureka, Utah, 467 

 Europe, 182 



Evaporation, 10, 16, 49, 76, 260, 360, 397 

 Evolution of soils, 76 

 Excavations, 224 



in permafrost areas, 258, 268 

 Exchangeable bases, 5, 30, 55, 109, 234, 



310, 465, 608 

 Expansion characteristics of soil, 184, 185 

 Experimental flumes, 67 

 Exploration geophysics, for petroleum 



and minerals, 74, 77 

 Exploration procedure in foundation 



studies, 174 

 Explosions, volcanic, 7 

 Explosives, 268 



F 



Fades relationships, 560 



Factor of safety, 104, 138, 156, 175, 176, 



223 

 Factors affecting, beach erosion, 282 



debris erosion, 338 



embankment stability, 191 



permafrost, 259 



properties of clays, 465 



reservoir properties, 348, 603 



slumping, 231 



soil formation, 41 



weathering, 4 



