  - Acceleration of moment of momentum, 377
- Aldebaran, 27, 28
- Anderson, Dr., 356
- Andromeda, Great Nebula in, 43, 204
- Antinous, Cluster of stars in, 353
- Apteryx, Rudimentary wing-bones of, 364, 366
- ——, Skeleton of, 364, 366
- ——, The, 363, 365
- Arcturus, Spectrum of, 85
- Argon, 265
- Argus and surrounding stars, 103
- Ariel, 338
- Boring, The great, 123
- Brooks’ comet, 89
- Bunsen burner, The, 283
- Butterfly and the oak-tree, The, 15
- Calcium, 274
- Capella, Spectrum of, 61–64
- Carbon, 280
- Ceres, 311
- Change of moment of momentum, 375
- Cluster, Nebulous region round a, 33
- Clusters of stars, 53–60, 203
- —— —— of 17th magnitude, 353
- Coal-unit, 110
- Collisions, 219, 380
- ——, Cause of formation of nebulÆ, 356
- Comets, 37
- Comet, Brooks’, 89
- —— of 1882, 119
- ——, Spectrum of, 290
- Common, Dr. A. A., 44
- Concord, The first, 294–307
- ——, The second, 308–323
- ——, The third, 324–336
- Conglomerates, 159
- Conservation of moment of momentum, 374
- Corona of the sun, 117
- Crab nebula, The, 19, 44
- Crossley Reflector, The, 45, 46, 48, 49, 50, 67, 199
- Cygnus, Nebula in, 329
- Dark bodies in universe, 35540, 41,
- Transcriber’s Notes:
- The raised dot (·), used to indicate multiplication, was confused with the decimal point in several numbers. The raised dot has been changed to the decimal point in numbers and the raised dot used only for multiplication.
- In places where “×” was used for multiplication, it was left as the author wrote it.
- Missing or obscured punctuation was silently corrected.
- Typographical errors were silently corrected.
- Inconsistent spelling and hyphenation were made consistent only when a predominant form was found in this book.
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