174 INDEX 



Murray, Sir John, investigator of deep- 

 sea sediments, 12, 165 



IN egative strips," 82 ft, 89 ft 



Nero Deep, gravity over the, 77 ff 



Netherlands Geodetic Commission, 28 



New Orleans, 10 1 



Newton, Sir Isaac, 4 



Niger River, relation to Niger canyon, 



154 

 Niaufou Island, 51 

 Niskanen, E., on upheaval of Finland, 



40, 41, 165 

 Nomwin atoll, 67 



Non-basaltic lavas, origin of, 48, 58 

 Norfolk, Virginia, 116 

 Norfolk Canyon, 116, 120 

 North Khartoum, sandstorm at, 137 

 North Sea, 8 



Northwest Territories, observations in, 44 

 Nubia, sandstorm in, 137 



Oahu Island, a test of crustal strength, 



63 

 Ocean 



dimensions of, 6, 7 



floor of, 8, 1 iff 



mean density of, 25 



mean depth of, 7, 25 

 Ofu Island, origin of, 55 

 Olosega Island, origin of, 55 

 Ontario, observations in, 44 

 Ooze, deep-sea, 13 



1 acific Ocean 



islands of, 50 



wave-velocities under, 20, 45 

 Palawan Bank, "drowned" atolls on, 76 

 Paleontological proof of crustal stability, 



65 

 Patagonia, 8 

 Penck, A., 38 



Pendulum, gravity-measuring, 27 

 Peridot, 58 

 Peridotite, 58, 95 



vitreous, 59 

 Peridotitic earth-shell, 58, 96 

 Peros Banhos Bank, 68 



Peru, observations on gravity in, 28 



Philippine group, "drowned" atolls of, 

 75 



Piggot, C. S., investigator of deep-sea 

 deposits, 12, 165 



Plasticity, of the earth's body, 2, 46 



"Plateaus" 

 continental, 5 

 submarine, 9 



Pleistocene Period, canyon-cutting dur- 

 ing, 128 



Plumb-line, deflection of the, 23, 26 



Porto Rico Deep, 82 



Position at sea, fixing, 6 



Post-Glacial time 



definition of, 35, 40, 136 

 marine conditions of, 141, 154 



Pressure, all-sided, increasing strength of 

 rock, 78 



Pressures in the earth, 16 



Profile of equilibrium of continental ter- 

 race, 100, 153 



Pseudo-Rayleigh (seismic) waves, 16, 

 19, 20 



Puerco River, silt suspended in, 146 



Push waves, 14, 18 



Jtvadio-acoustic ranging, 7 



Radioactive furnace, 33 



Radioactivity of rocks, 33, 44 



Rayleigh, Lord, 16 



Rayleigh (seismic) waves, 16 



Recoil of the earth's crust after deglacia- 

 tion, 36, 44, 157 



Reefs, coral. See Coral reefs 



Reflection (seismic) method of finding 

 discontinuities, 107 



Reflux currents in relation to submarine 

 valleys, 134 



Refraction (seismic) method in geo- 

 physical research, 107 



Relief of the sea floor, 8, 122 



Renner, F. G. See Figures 68 and 69 



Reservoirs with density currents, 144, 

 146, 147, 151, 166 



Rhine River delta, in Lake Constance, 

 144 



Rhone River delta 



of Lake Geneva, 142 ff 



of the Mediterranean Sea, 103 



