the _Proceedings_ two illustrations of their
spectroscopic results.

G. E. H.

January, 1922.

CONTENTS

CHAPTER
I. THE NEW HEAVENS
II. GIANT STARS
III. COSMIC CRUCIBLES

ILLUSTRATIONS

FIG.
1. The Constellation of Orion (Hubble)
2. The Great Nebula in Orion (Pease)
3. Model by Ellerman of summit of Mount Wilson, showing the observatory
buildings among the trees and bushes
4. The 100-inch Hooker telescope
5. Erecting the polar axis of the 100-inch telescope
6. Lowest section of tube of 100-inch telescope, ready to leave Pasadena
for Mount Wilson
7. Section of a steel girder for dome covering the 100-inch telescope,
on its way up Mount Wilson
8. Erecting the steel building and revolving dome that cover the Hooker
telescope
9. Building and revolving dome, 100 feet in diameter, covering the
100-inch Hooker telescope
10. One-hundred-inch mirror, just silvered, rising out of the
silvering-room in pier before attachment to lower end of telescope
tube. (Seen above)
11. The driving-clock and worm-gear that cause the 100-inch Hooker
telescope to follow the stars
12. Large irregular nebula and star cluster in Sagittarius (Duncan)
13. Faint spiral nebula in the constellation of the Hunting Dogs (Pease)
14. Spiral nebula in Andromeda, seen edge on (Ritchey)
15. Photograph of the moon made on September 15, 1919, with the 100-inch
Hooker telescope (Pease)
16. Photograph of the moon made on September 15, 1919, with the 100-inch
Hooker telescope (Pease)
17. Hubble's Variable Nebula. One of the few nebulae known to vary in
brightness and form
18. Ring Nebula in Lyra, photographed with the 60-inch (Ritchey) and
100-inch (Duncan) telescopes
19. Gaseous prominence at the sun's limb, 140,000 miles high (Ellerman)
20. The sun, 865,000 miles in diameter, from a direct photograph showing
many sun-spots (Whitney)
21. Great sun-spot group, August 8, 1917 (Whitney)
22. Photograph of the hydrogen atmosphere of the sun (Ellerman)
23. Diagram showing outline of the 100-inch Hooker telescope, and path of
the two pencils of light from a star when under observation with the
20-foot Michelson interferometer
24. Twenty-foot Michelson interferometer for measuring star diameters,
attached to upper end of the skeleton tube of the 100-inch Hooker
telescope
25. The giant Betelgeuse (within the circle