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	3242 {	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.
64	7009 {	1899, July	30	0	2	}17	S {	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.