Nebulae, 84-86; nebulous Milky Way at right angles with that of the stars, 150-153; nebulous spots, conjectures on, 83-86; nebulous stars and planetary nebulae, 85, 151, 152; nebulous vapor, 83-86, 87, 152; their supposed condensation in conformity with the laws of attraction, 84.
Neilson, gradual depression of the southern part of Sweden, 295.
Nericat, Andrea de, popular belief in Syria on the fall of aerolites, 123.
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.