i v TABLE OF CONTENTS. 



and Instruments : New or Proposed Observatories : in Minnesota, 33 ; in 

 California, 34 ; at Quito, 35 ; at Cordoba, 36, 37 ; at Oxford, 35. Miscella- 

 neous : Telegraphic Standard of Time, 33, 147 ; Ancient Sun-dials, 40 ; a 

 Striking Sun-dial, 45. 



B. TERRESTRIAL PHYSICS AND METEOROLOGY (xxxi, xxxiv) 47 



(a.) TERRESTRIAL PHYSICS (including Dynamical Geology). 



The Land in general: Physical Geography of Chile, 113. Subsidence 

 and Shrinkage : Contraction of the Earth's Diameter, 52 ; Shrinkage of 

 the Earth and Terrestrial Magnetism, 52. Earthquakes : in North Caro- 

 lina, 47 ; in New England, 48 ; in Central Germany in 1872, 48 ; in the 

 Caucasus, 50. Volcanoes : Mallet's Theory of, 122. Terrestrial Mag- 

 netism : Shrinkage of the Earth and, 52 ; Daily Variation in, 53 ; Secular 

 Changes in, 153 Variation in Magnetic Declination, 158 ; Earth Currents, 

 150 ; New Magnetic Chart, 158. The Interior Waters : Tides in Lake 

 Geneva, 53 ; Fluctuations in Level of American Lakes, 54 ; Low Water in 

 the River Seine, 107. The Ocean: General: Physical Condition of the 

 Arctic Seas, 56; Formation of Icebergs, 107. Tides: in Arctic Ocean, 55; 

 of Tahiti, 109 ; Action on Sea-bottom, 55. Currents : Ocean Circulation, 

 57 ; Influence of, on Temperature, 108 ; Theory of Under-currents, 122. 

 Temperatures : in South Atlantic, 56 ; at Surface of Atlautic, 62. Ex- 

 plorations : of Adriatic, 113. See also Geography. The Atmosphere 

 or the Air. See Meteorology. 

 (b.) METEOROLOGY. 



The Atmosphere in general : Acoustic Transparency of the Air, 78 ; 

 Carbonic Acid in, 110 ; Protecting Influence of, 120. General Climatol- 

 ogy : Influence of the Moon on the Weather, 69 ; Meteorology and Sun 

 Spots, 79, 80 ; Law of Storms in North America, 111 ; Sunset Tints and 

 Arcs, 68 ; Colliery Explosions and the Weather, 72 ; Temperature and 

 Pressure during Monsoon Months, 117 ; Weather of December, 1873, 73 ; 

 New Text-book, 77. Meteorological Observations : in the United States 

 Report of Chief Signal Officer for 1873, 60, 81 ; in Alaska, 82 ; St. Paul's 

 Island, 83; in the Argentine Confederation, 68; in Japan, 115, 116 ; in Ca- 

 rinthia, 123; in Russia, 85; in Bengal, 74; Maritime Meteorology, 70, 87, 115; 

 Admiralty Wind and Current Charts, 114 ; Hoffmeyer's Charts, 76. Weath- 

 er Signals and Predictions : Use of High Stations in Weather Predictions, 

 63 ; Signals of London Board of Trade, 71 ; of Canada, 88 ; of the United States, 

 60; in the Mauritius, 86 ; Deville's Predictions, 11 2. Climate : Periodicity 

 of, 65 ; Climate of Tiflis, 63 ; of Bombay, 77. Atmospheric Electricity. 

 See Electricity ; Physics. Atmospheric Pressure and the Winds : Re- 

 duction of Barometric Observations to the Sea-level, 88 ; Barometric Va- 

 riations, 119; Remarkable Barometric Depression in England, 89 ; Mathe- 

 matical Theory of the Winds, 123 ; Inclination of Wind to the Earth's Sur- 

 face, 124; Influence of the Sun on the Winds, 118; Hail-storms in Europe, 

 124 ; Movement of Storm-centres, 76 ; Winds of Northern India, 92, 93 ; of 

 West Indies, 118 ; Tornado of May 22, 1873, 94 ; Cyclone in Nova Scotia, 90 ; 

 in Calcutta, 90; in the Mauritius, 120. See also General Climatology. 

 Temperature : of Ocean, 56, 62 ; of Rain-water, 121 ; of Clouds, 98 ; of 

 St. Petersburg, 99 ; of Helsingfors, 100 ; Change of, with Altitude, 97 ; In- 



