Part 3

Observed July 29, 1878, at Creston, Wyoming Territory.

IV. AURORA BOREALIS.

As observed March 1, 1872, at 9h. 25m. P. M.

V. THE ZODIACAL LIGHT.

Observed February 20, 1876.

VI. MARE HUMORUM.

From a study made in 1875.

VII. PARTIAL ECLIPSE OF THE MOON.

Observed October 24, 1874.

VIII. THE PLANET MARS.

Observed September 3, 1877, at 11h. 55m. P. M.

IX. THE PLANET JUPITER.

Observed November 1, 1880, at 9h. 30m. P. M.

X. THE PLANET SATURN.

Observed November 30, 1874, at 5th. 50m. P. M.

XI. THE GREAT COMET OF 1881.

Observed on the night of June 25-26, at 1h. 30m. A. M.

XII. THE NOVEMBER METEORS.

As observed between midnight and 3 o'clock A. M., on the night of November 13-14, 1868.

XIII. PART OF THE MILKY-WAY.

From a study made during the years 1874, 1875 and 1876.

XIV. STAR-CLUSTER IN HERCULES.

From a study made in June, 1877.

XV. THE GREAT NEBULA IN ORION.

From a study made in the years 1873-76.

Reproduced from the Original Drawings, by Armstrong & Company, Riverside Press, Cambridge, Mass.

GENERAL REMARKS ON THE SUN

The Sun, the centre of the system which bears its name, is a self-luminous sphere, constantly radiating heat and light.