Newton, discussed the question on the difference between the attraction of
masses and molecular attraction, 63; Newtonian axiom confirmed by Bessel,
64; his edition of the Geography of Varenius, 66; Principia Mathematica, 67;
considered the planets to be composed of the same matter with the Earth,
132; compression of the Earth, 165.
Nicholl, J. P., note from his account of the planet Neptune, 90, 91.
Nicholson, observations of lighting clouds, unaccompanied by thunder or
indications of storm, 337.
Nobile, Antonio, experiments of the height of the barometer, and its
influence on the level of the sea, 298.
Noggerath counted 792 annual rings in the trunk of a tree at Bonn, 283.
Nordmann on the existence of animalcules in the fluids of the eyes of
fishes, 345.
Norman, Robert, invented the inclinatorium, 179.
Observations, scientific, mischief of inaccurate, 38; tendency of
unconnected, 40.
Ocean, general view of, 292-311; its extent as compared with the dry land,
288, 289; its depth, 160, 302; tides, 304, 305; decreasing temperature at
increased depths, 302; uniformity and constancy of temperature in the same
spaces, 303; its currents and their various causes, 306-309; its
phosphorescence in the torrid zone, 202; its action on climate, 303,
319-320; influence on the mental and social condition of the human race,
162, 291, 292, 294, 310; richness of its organic life, 300, 310; oceanic
microscopic forms, 342, 343; sentiments excited by its contemplation, 310.
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