Origin of the World according to Kant--Laplace's Nebular Hypothesis--Maintenance of the Sun's Heat--Meteoric Hypothesis--Radiation as an Effect of Contraction--Regenerative Theory--Faye's Scheme of Planetary Development--Origin of the Moon--Effects of Tidal Friction 308
Donati's Comet--The Earth again Involved in a Comet's Tail--Comets of the August and November Meteors--Star Showers--Comets and Meteors--Biela's Comet and the Andromedes--Holmes's Comet--Deflection of the Leonids--Orbits of Meteorites--Meteors with Stationary Radiants--Spectroscopic Analysis of Cometary Light--Comet of 1901--Coggia's Comet 323
Forms of Comets' Tails--Electrical Repulsion--Brédikhine's Three Types--Great Southern Comet--Supposed Previous Appearances--Tebbutt's Comet and the Comet of 1807--Successful Photographs--Schaeberle's Comet--Comet Wells--Sodium Blaze in Spectrum--Great Comet of 1882--Transit across the Sun--Relation to Comets of 1843 and 1880--Cometary Systems--Spectral Changes in Comet of 1882--Brooks's Comet of 1889--Swift's Comet of 1892--Origin of Comets 345
Stellar Chemistry--Four Orders of Stars--Their Relative Ages--Gaseous Stars--Spectroscopic Star-Catalogues--Stellar Chemistry--Hydrogen Spectrum in Stars--The Draper Catalogue--Velocities of Stars in Line of Sight--Spectroscopic Binaries--Eclipses of Algol--Catalogues of Variables--New Stars--Outbursts in Nebulæ--Nova Aurigæ--Nova Persei--Gaseous Nebulæ--Variable Nebulæ--Movements of Nebulæ--Stellar and Nebular Photography--Nebulæ in the Pleiades--Photographic Star-charting--Stellar Parallax--Double Stars--Stellar Photometry--Status of Nebulæ--Photographs and Drawings of the Milky Way--Star Drift 372
Development of Telescopic Power--Silvered Glass Reflectors--Giant Refractors--Comparison with Reflectors--The Yerkes Telescope--Atmospheric Disturbance--The Lick Observatory--Mechanical Difficulties--The Equatoreal _Coudé_--The Photographic Camera--Retrospect and Conclusion 428
Chronology, 1774-1893--Chemical Elements in the Sun (Rowland, 1891)--Epochs of Sun-spot Maximum and Minimum from 1610 to 1901--Movements of Sun and Stars--List of Great Telescopes--List of Observatories employed in the Construction of the Photographic Chart and Catalogue of the Heavens 443