208 
Sinusoidal waves 5, 14 
Sleet 55 
Slob ice 53 
Sludge ice 53 
Slush 52 
Snappers, bottom 25 
Snow flakes 93 
slush 53 
Specter of the Brocken 98 
Spectrum 83 
Speed of waves 6, 7 
Spitzbergen 101 
Spitzer, Lyman 72 
St. Elmo’s fire 126 
Stars? - 169, 557 
structure of 159 
twinkling of 6 
Starfish 178, 179 
Storm wave 12 
Stratosphere 101 
Submarine, as laboratory 4 
earthquake 10 
topography 21 
Sumatra 13 
Sun) *155 
dogs 94 
Sunda Straits 138 
Sunset, color of 14 
Sunspots 157 
Surf 7 
Sverdrup, H. V. 10 
Swells 9 
Syracuse, siege of 38 
Tem 192, 193 
Theory vs. Fact 111 
Thunder 124 
Tidal currents 61 
retardation of earth 146 
wave 13 
Tides, exceptional 45 
prediction 45 
theory of 41 
Tombaugh, C. W. 154 
Transoceanic cables 10, 25 
Index 
Trochoid 5 
Tropic bird 198 
Troposphere 101 
Tsunami 12 
Turbulence 10, 18 
Twilight 104 
Undertow 8 
Universe 161 
Uranus. 2az 
Valdivia 70 
Venus 148 
Vibration 14 
Virgil 62 
Volcanic dust 80 
islands 67 
Vulcan 143 
Wake, ship’s 16 
Walrus 168 
Water sky 98 
Waterspouts 133 
Waves, bow 16 
cause of 8 
energy of 3 
general 3 ff. 
internal 19 
length 6 
motion 4 
reflection 9 
shape 5, 9 
size 8 
speed 6 
stern 16 
Weddell, James 70 
Wegener 67 
West Indies 12 
West Point 121 
Whales 165 
Whirlpool 62 
Wind, causes of 3 
roses 127 
Woodcock, A. 173 
World island 67 
Zodiac 187 
