approximation of comets. Passage through the system of Jupiter's satellites. Comets of short periods of revolution, more correctly termed inner comets (Encke, Biela, Faye) -- p. 107 and note. Revolving aerolites (meteoric stones, fire-balls, falling stars). Their planetary velocity, magnitude, form, observed height. Periodic return in streams; the November stream and the stream of St. Lawrence. Chemical composition of meteoric asteroids -- p. 130 and notes. Ring of zodiacal light. Limitation of the present solar atmosphere -- p. 141 and note. Translatory motion of the whole solar system -- p. 145-149 and note. The existence of the law of gravitation beyond our solar system. The milky way of stars and its conjectured breaking up. Milky way of nebulous spots, at right angles with that of the stars. Periods of revolutions of bi-colored double stars. Canopy of stars; openings in the stellar stratum. Events in the universe; the apparition of new stars. Propagation of light, the aspect of the starry vault of the heavens conveys to the mind an idea of inequality of time -- p. 149-154 and notes. II. Terrestrial Portion of the Cosmos . . . . . . . . . . . . . . Page 154-359 a. Figure of the earth. Density, quantity of heat, electro-magnetic tension, and terrestrial light -- p. 154-202 and note. Knowledge of the compression and curvature of the earth's surface acquired by measurements of degrees, pendulum oscillations, and certain inequalities in the moon's orbit. Mean density of the earth. The earth's crust, and the depth to which we are able to penetrate -- p. 159, 160, note. Threefold movement of the heat of the earth; its thermic condition. Law of the increase of heat with the increase of depth -- p. 160, 161 and note. Magnetism electricity in motion. Periodical variation of terrestrial magnetism. Disturbance of the regular course of the magnetic needle. Magnetic storms; extension of their action. Manifestations of magnetic force on the earth's surface presented under three classes of phenomena, namely, lines of equal force (isodynamic), equal inclination (isoclinic), and equal deviation (isogonic). Position of the magnetic pole. Its probable connection with the poles of cold. Change of all the magnetic phenomena of the earth. Erection of magnetic observatories p 19 since 1828; a far-extending net-work of magnetic stations -- p. 190 and note. Development of light at the magnetic poles; terrestrial light as a consequence of the electro-magnetic activity of our planet. Elevation of polar light. Whether magnetic storms are accompanied by noise. Connection of polar light (an electro-magnetic development of light) with the formation of cirrus clouds. Other examples of the generation of terrestrial light -- p. 202 and note.