LIST OF ILLUSTRATIONS.

No. N.G.C. No. Date. Exposure. Enlargement. Orientation Top. Remarks

h m

1 224 1899, September 7 3 0 2.0 W Great nebula in Andromeda.

2 253 1902, December 18-20 3 0 2.5 S H V, 1.

3 598 1899, September 12 3 30 2.1 W M 33.

4 628 1899, October 31 4 0 3.4 S M 74.

5 650 1899, September 11 3 0 3.4 S M 76.

6 891 1899, November 6 4 0 3.4 S H V, 19.

7 1068 1899, December 3 3 0 7.2 S M 77.

8 .. 1899, December 28 4 0 2.1 W Pleiades.

9 1952 1899, December 24 2 0 3.4 S Crab nebula.

10 .. 1898, November 16 0 40 2.2 S Great nebula in Orion.

11 .. 1899, February 9 0 5 2.5 S Great nebula in Orion.

12 1977 1900, January 21 2 50 2.4 S H V, 30.

13 2024 1902, January 28 3 0 2.4 S H V, 28.

14 2068 1902, November 26 3 0 2.4 S M 78.

15 2264 1903, February 23 3 0 2.5 S Nebula near 15 Monocerotis.

16 .. 1903, February 26 4 0 2.5 S New nebula in Monoceros (Roberts).

17 2403 1900, February 27 4 0 3.4 S H V, 44.

18 2683 1900, February 23 3 20 3.3 S H I, 200.

19 2841 1901, April 17 3 0 3.4 S H I, 205.

20 2903-5 1900, February 24 3 30 3.4 S H I, 56, 57.

21 3031 1900, March 21 3 55 3.4 S M 81.

22 3115 1901, April 9 2 30 5.0 S H I, 163.

23 3198 1900, March 24 4 0 4.3 S H I, 199.

24 3226-7 1901, April 10 3 0 3.4 S H II, 28, 29.

25₁ 3242 { 1901, April 9 0 1 20 S H IV, 27.

25₂ 1901, April 8 0 10 20 S H IV, 27.

26 3556 1902, May 3 4 0 3.3 S H V, 46.

27 3587 1900, March 28 4 0 3.3 S Owl nebula.

28 3623 1900, April 23 3 30 3.8 S M 65.

29 3627 1900, April 23 3 30 4.3 S M 66.

30_A 3726 1900, March 29 4 0 4.9 S H II, 730.

30_B 3726 1900, March 29 4 0 4.9 S H II, 730.

31 4244 1900, March 30 3 0 3.7 S H V, 41.

32 4254 1902, June 7 3 19 3.7 S M 99.

33 4258 1903, May 23 3 53 3.8 S H V, 43.

34 4303 1900, April 27 3 0 3.4 S M 61.

35 4321 1901, April 19 3 0 4.2 S M 100.

36 4485-90 1901, April 17 1 45 4.4 S H I, 197-8.

37 4501 1902, June 27-28 3 0 3.9 S M 88.

38 4536 1903, May 27 3 30 3.3 S H V, 2.

39 4559 1901, May 9 3 0 3.4 S H I, 92.

40 4565 1901, April 21 3 0 3.3 S H V, 24.

41 4631 1902, June 6 3 0 3.3 S H V, 42.

42 4725 1902, June 30-July 2 3 32 3.4 S H I, 84.

43 4736 1902, July 7 0 30 3.3 S M 94.

44 4736 1902, July 4 3 0 3.3 S M 94.

45 4826 1900, May 27 2 30 3.8 S M 64.

46 5055 1902, July 5 3 30 3.3 S M 63.

47 5194-5 1899, May 10 4 0 3.3 S M 51.

48 5272 1900, May 22 1 30 3.8 S M 3.

49 5457-8 1899, June 8 4 0 3.2 S M 101.

50 5857-9 1900, May 31 2 30 7.2 S H II, 751-2.

51 5866 1902, July 28 3 0 4.9 S H I, 215.

52 5904 1900, May 24 1 30 3.7 S M 5.

53 6205 1900, June 22 2 0 3.8 S M 13.

54 6218 1899, July 11 2 0 3.7 S M 12.

55 6514 1899, July 6 3 0 4.1 S Trifid nebula.

56 6523 1899, July 7 4 0 2.0 W M 8.

57 6543 1899, August 8 0 5 19 S H IV, 37.

58 6618 1899, July 9 4 0 3.1 S Omega nebula.

59 6720 1899, July 14 0 10 13 S M 57.

60 6853 1899, July 31 3 0 3.8 S Dumb-Bell nebula.

61 6894 1899, August 9 1 0 7.2 S H IV, 13.

62 6946 1899, August 7 4 0 3.9 S H IV, 76.

63 6995 1899, August 29 4 0 2.2 S Network nebula in Cygnus.

64 7009 { 1899, July 28 0 10 }17 S { H IV, 1.

1899, July 30 0 2 H IV, 1.

65 7023 1903, August 19-20 3 0 3.8 S H IV, 74.

66 7217 1899, August 12 4 0 7.1 S H II, 207.

67 7331 1899, August 11 4 0 3.8 S H I, 53.

68 7479 1899, August 9 2 0 4.8 S H I, 55.

69 7662 1899, September 5 { 10^s }17 S H, IV, 18.

20^s

30^s

1^m

2^m

70 7814 1899, September 30 3 0 4.9 S H II, 240.

Plate 1

The Great Nebula in Andromeda

Plate 2

The Spiral Nebula H.V.I. Ceti

Plate 3

The Spiral Nebula M.33 Trianguli

Plate 4

The Spiral Nebula M.74 Piscium

Plate 5

The Nebula M.76 Persei

Plate 6

The Nebula H.V. 19 Andromedae

Plate 7

The Spiral Nebula M.77 Ceti

Plate 8

The Pleiades

Plate 9

The Crab Nebula in Taurus

Plate 11

Central Portion of the Great Nebula in Orion

Plate 12

The Nebula H.V. 30, Orionis

Plate 13

The Nebula H.V. 28 Orionis

Plate 14

The Nebula M.78 Orionis

Plate 15

Nebula near 15 Monocerotis

Plate 16

New Nebula in Monoceros (Roberts)

Plate 17

The Spiral Nebula H.V.44 Camelopardi

Plate 18

The Nebula H.I.200 Leonis Minoris

Plate 19

The Spiral Nebula H.I.205 Ursae Majoris

Plate 20

The Spiral Nebula H.I.56-57 Leonis

Plate 21

The Spiral Nebula M 81, Ursae Majoris

Plate 22

The Nebula H.I.163, Sextantis

Plate 23

The Spiral Nebula H.I.199, Ursae Majoris

Plate 24

The Double Nebula H.II 28-29, Leonis

Plate 25

The Planetary Nebula H.IV 27, Hydrae

Plate 26

The Nebula H.V 46, Ursae Majoris

Plate 27

The Owl Nebula, M 97, Ursae Majoris

Plate 28

The Spiral Nebula M 65, Leonis

Plate 29

The Spiral Nebula M 66, Leonis

Plate 30 A

The Spiral Nebula H.II, 730, Ursae Majoris

Plate 30 B

The Spiral Nebula H.II, 730, Ursae Majoris

Plate 31

The Nebula H.V 41, Canum Venaticorum

Plate 32

The Spiral Nebula M 99, Comae Berenices

Plate 33

The Spiral Nebula H.V 43, Ursae Majoris

Plate 34

The Spiral Nebula M 61, Virginis

Plate 35

The Spiral Nebula M 100, Comae Berenices

Plate 36

The Nebula H.I 197-198, Canum Venaticorum

Plate 37

The Spiral Nebula M 88, Comae Berenices

Plate 38

The Spiral Nebula H.V 2, Virginis

Plate 39

The Spiral Nebula H.I 92, Comae Berenices

Plate 40

The Nebula H.V 24, Comae Berenices

Plate 41

The Nebula H.V 42, Comae Berenices

Plate 42

The Spiral Nebula H.I 84, Comae Berenices

Plate 43

The Spiral Nebula M 94, Canum Venaticorum

Plate 44

The Spiral Nebula M 94 Canum Venaticorum

Plate 45

The Spiral Nebula M 64, Comae Berenices

Plate 46

The Spiral Nebula M 63, Canum Venaticorum

Plate 47

The Spiral Nebula M 51, Canum Venaticorum

Plate 48

The Star Cluster M 3, Canum Venaticorum

Plate 49

The Spiral Nebula M 101, Ursae Majoris

Plate 50

The Double Nebula H.II 751-752, Bootis

Plate 51

The Nebula H.I 215, Draconis

Plate 52

The Star Cluster M 5, Librae

Plate 53

The Star Cluster M 13, Herculis

Plate 54

The Star Cluster M 12, Ophiuchi

Plate 55

The Trifid Nebula, M 20, Sagittarii

Plate 56

The Nebula M 8, Sagittarii

Plate 57

The Planetary Nebula H.IV 37, Draconis

Plate 58

The Horse Shoe Or Omega Nebula M 17, Sagittarii

Plate 59

The Ring Nebula, M.57, in Lyra

Plate 60

The Dumb-Bell Nebula in Vulpecula

Plate 61

The Annular Nebula H.IV 13, Cygni

Plate 62

The Spiral Nebula H.IV 76, Cephei

Plate 63

The Net-work Nebula in Cygnus

Plate 64

The Planetary Nebula H.IV 1, Aquarii

Plate 65

The Nebula H.Iv 74, Cephei

Plate 66

The Nebula H.II 207, Pegasi

Plate 67

The Spiral Nebula H.I 53, Pegasi

Plate 68

The Spiral Nebula H.I 55, Pegasi

Plate 69

The Planetary Nebula H.IV 18, Andromedae

Plate 70

The Nebula H.II 240, Pegasi

Footnotes:

[1] Reprinted from The Astrophysical Journal, 11, 325, 1900.

[2] For a more complete history of this part of the subject, see Dr. Holden’s articles in Pub. Ast. Soc. Pacific, 7, 197 et seq., 1895.

[3] The difficulties here referred to, about which a good deal has been written, seem to have had their origin in the fact that it was impossible, at the time of the preliminary trials, to provide the observer with an assistant, while the Crossley reflector is practically unmanageable by a single person.

[4] Mon. Not. R. A. S., 48, 386.

[5] Kindly lent by the Astronomical Society of the Pacific.

[6] Mem. R. A. S., 46, 173.

[7] Mon. Not. R. A. S., 48, 280, 1888.

[8] Mon. Not. R. A. S., 49, 297. The construction here described is not followed exactly in the Crossley apparatus. The guiding eyepiece slides freely when not held by a clamp. Pin-holes for preventing fogging are unnecessary when red light is used.

[9] It so happens that the tension of the vertical thread is such that it begins to slacken when the temperature falls to within about 2° of the dew point. The thread thus forms an excellent hygrometer, which is constantly under the eye of the observer. When the thread becomes slack, it is time to cover the mirrors.

[10] Mon. Not. R. A. S., 48, 352.

[11] The following list includes all papers of interest:

“Photographic Observations of Comet I, 1898 (Brooks), made with the Crossley Reflector of the Lick Observatory.” A. J. No. 451, 19, 151; see also Ap. J., 8, 287.

“The Small Bright Nebula near Merope,” Pub. A. S. P., 10, 245.

“On Some Photographs of the Great Nebula in Orion, taken by means of the Less Refrangible Rays in its Spectrum,” Ap. J., 9, 133. See also Pub. A. S. P., 11, 70; Ap. J., 10, 167; A. N., 3601.

“Small Nebulæ discovered with the Crossley Reflector of the Lick Observatory,” Mon. Not. R. A. S., 59, 537.

“The Ring Nebula in Lyra,” Ap. J., 10, 193.

“The Annular Nebula H. IV. 13 in Cygnus,” Ap. J., 10, 266; see also Pub. A. S. P., 11, 177.

“On the Predominance of Spiral Forms among the Nebulæ,” A. N., 3601.

“The Distribution of Stars in the Cluster Messier 13 in Hercules” (by H. K. Palmer), Ap. J., 10, 246.

“The Photographic Efficiency of the Crossley Reflector,” Pub. A. S. P., 11, 199; Observatory, 22, 437.

“New Nebulæ discovered photographically with the Crossley Reflector of the Lick Observatory,” Mon. Not. R. A. S., 60, 128.

“The Spiral Nebula, H. I., 55 Pegasi,” Ap. J., 11, 1.

“Photographic Observations of Hind’s Variable Nebula in Taurus, made with the Crossley Reflector of the Lick Observatory,” Mon. Not. R. A. S., 60, 424.

“Use of the Crossley Reflector for Photographic Measurements of Position,” Pub. A. S. P., 12, 73.

“Discovery and Photographic Observations of a New Asteroid 1899 FD.,” A. N., 3635.

“Elements of Asteroid 1899 FD.” (by H. K. Palmer), A. N. 3635.

[12] Footnote added in 1908: This concluding paragraph, retained in the present publication for completeness, loses point in some particulars, because the photogravure referred to is not reproduced here. The heliogravure reproduction of the Trifid nebula is No. 55.

[13] Since then a photograph by Dr. Roberts has appeared in Knowledge, 23, 35, February, 1900.