I N D E X

A

Aberration for various objects, 40
Absorption of light, 87
Achromaicity of object-glass, 47
Agreement of Cycle and Struve, 85
Airy on β Cygni at last, 89
Albireo or β Cygni, 65, 71
from Greenwich, 89
Alta Vista, in Teneriffe, observations
made there, 12
Altitude always to be considered in
noting for colour, 46
Ammonio-sulphate of copper blue, 67
Analysis of sideral colours, 32
Ancient notions of the stars, 13
γ Andromedae using the anomalies, 31
Anomalies sometimes only apparent, 31
from atmosphere, 82
Angle in Astronomy, 42
Aplanatic by Horne, 59
APPENDIX No.I, 77
APPENDIX No.II, 82
Aqua colestis, an alchymical name, 61
Assumed instance of a sudden star, 42
Astronomische Nachrichten, 23
Arago on refrangible stars, 13
quoted on the colour of stars, 18
Couriers’ spectrum, 42
insufficently exact, 45
popular astronomy quoted, 86
Argument resumed on the changes of
colour, 43
Astrometry by Sir J. Herschel, 38
*Astronomer Royal on the spectrum, 53
his suggestion, 81
Atmosphere, errors arising from it, 46
Atmospheric effects, 82

*Atomic Dalton, the Quaker, 71
Atoms intercepting waves of light, 88
Augtistine’s ejaculation, 77
Author’s endeavours to be exact, 45
Australian telescope. 72

B

Bacon says “recte seire,” &c. 43
Barkly, Sir H. Governor of Victoria, 72
β Cygni, its colours, 55
Bedford Catalogue on colours, 23
Bedford and Teneriffe colours
compared, 33
Bichromate potassa yellow, 67
Billions of vibrations by light, 37
Binary, 95 Herculis a doubtful one, 80
Bird on Cygni, 62
Bishop’s assistant observer, 69
Blindness relative to colour, 71
Blue, some of the smallest stars, 15
stars least numerous, 15
stars not observed or recorded by
the ancients, 16
is the coldest colour, 37
of β Cygni how estimated, 67
Bradley, how to be received, 65
Brewster, Sir D. on sidereal spectra, 31
Brightness and colours connected, 44
Brisbane, Sir Thomas, his observations at
Paramatta, 17
* “By many blows,” &c 39

C

Carpenter’s comparison of colours, 89
Carr, T. W. and 95 Herculis, 35
α Centauri, a well-known star, 39
Change of colour instanced, 17
- with distance, 38

Change of colour in 95 Herculis, 77
Changes of hue in 95 Herculis, 79
Chemical elements detected by the
spectra, 88
Chemistry allied to astronomy, 53
Chevreul on chromatography, 49
quoted by Carpenter, 90
Chromatic diagram proposed, vii.
personal equation, 35
grades should be familiar, 48
Circumpolars good at all seasons, 46
*Collegio Romano, residence of Padre
Seechi, 25
Colour, how to be determined, 47
blindness described, 71
Colours of multiple stars, v.
refracted by the prism, viii.
contrastetl, see Herschel, H., 17
how proportioned, 23
described by Thomson, 23
sensible only to a fresh eye, 25
in succession, 43
and brightness are connected
in alterations, 44
not reducible to one prniciple
of Chromatics, 49
diagram of, 54
Colxa oil flame yellow of β Cygni, 89
Comets not alone the objects pursued
by De Vico, 26
Combustion indicated by the stars, 18
Comparative magnitudes, 37
- number in colour, 14
Components of 95 Herculis, 80
Complementary tints, 14
Constancy in angle and distance, 66
Contrast of colours in some stars, 50
Cooke of York, his telescopes, 81
Cor Caroli examined for colour, viii.
observed at Hartwell, 50
Cortez niztde his follows desperate, 52
Creator to be studied in his works, 77
Crimison star discovered by Hind, 19
Curves of liglit require, 21
Cycle quoted on double stars, 13
continued at Hartwell, 22

Cycle quoted on 95 Herculis, 78
quoted on the nebulae, 86

D

Dalton’s defective sight, 15, *71
Dark field essential for colours, vi.
Dawes quoted on star tints, 35
on β Cygni, 59
Dead language devoted to science, 74
Decimal proportions of light-syaves, 41
Decision in observation ciijoirted, 3S
De Coverley’s maxim very conveinient
in cases of doubt, 19
Deductions from star tints difficult, 16
Defective sight as to colors, 15
+De Morgan, Professor, quoted, 68
De Vico’s 29 stars, 23
died in London, 25
his observations at Rome, 35
Diagram of colours, 54
* of the undulatory theory, 83
Difficulties must not alarm, 38
Direct and incidential colours, 54
Discussion of the Teneriffe and Bedford
colours, 35
Distribution of coloured stars, 23
Divergence of colour observation, 85
Double stars permanent, 20
Dugold Stewart on vision, 16
Dunlop’s Catalogue of Blue Stars, 17

E

Eclipses of Jupiter’s satellites, 39
Edinburgh Astronomical Observations
quoted, 82
*Electric spark quoted by Seechi, 25
light, experiments on, 40
spark like a star, 43
Elevated regions best for telescopes, 53
Eligin’s, Lord, researches in Greece, 52
Emission ofuiidulatioii, 40
Error, the principle source of, 45
Estimate for the telescope, 73
Etna recommended to Lassell, 32
European observations compared with
southern, 84
Experience of the author, 45
Experiment by Mr. Huggins, 87

“Expose d’un Moyen de definir,” ∓c.
Chevreul, 90
Extinction of a star, 43
Extra meridional table, 66
Eye when fatigued not trustworthy, v.
applied to one purpose only, 47
piece, well achromatized, 47
Eyes, their various defects, 25

F

Fancy colours continued, vii.
Fatigue disqualifies the eye, v. 25
Field of view, the centre preferable, 47
Fiery star seen hy Hind in 1845, 29
Final finding, or mean of colours, 70
Fisher, Rev. G. on β Cygni, 70
Fixity on β Cygni, 65
Fletcher quoted on star tints, 35
Fletcher on β Cygni, 63
his observation in 1850, 69
Focus, its influence on colours, 90
Fog during the mininium of a star, 19
Frauenhofer of Munich’s measures of the
rays of the solar spectrum, 53; his
spectral lines referred to, 89
Frequency of observation eliminates
error, 46

G

Gazing called into aid, 56
George-town College in America, refuge
of Sestini, 24
Goethe, his theory erroneous, 44
steps out of his province, 22
Gradations of colour and a standard
required for stars, 48
Grant of Elchies, his telescope, 78
Green and blue stars, theoretically treated
by Arago, 18
Gregorian telescope at Hartwell, 48
Grubb of Dublin, 73
Guatjara, in Teneriffe, observations, made
there, 33, 78

H

Harmony of colours, 37
Hartwell and Madras Atlas, 21
sidereal experiments, 49
Hebe suspected by W.H. Smyth, 68

Hebe’s elements by Dr. Luther, 68
Heliometer turned upon β Cygni, 69
95 Herculis, a steady double-star, 21
among the anomalies, 31
its colours, 35
observations of, 60
instanced for change, 77
Herschel, the elder, v.
I. saw most stars reddish, 15
I. his reflectors coloured, 31
Sir W. on β Cygni, 59
II. on the sensorium, 16
quoted on light, 37
on the southern stars, 38
Sir J, on β Cygni;, 53
his undulatory theory, 41
on the value of time, 73
Higgens, Captain, of Bedford, 60
, observer of colours, 80, 81
High powers assimilate colours, 90>
Hill on β Cygni, 61
Hind on β Cygni, 68
Hind’s ruddy tinted stars, 19
Horizontal stars acted on by atmosphere
as by a prism, 46
Horne and Thornthwaite, 59
How to observe with comparitive exact-
ness, 45
Huddart, Capt. on defective sight, 16
Huggins on the colours of β Cygni. 67
Capt. on defective sight, 16
Huggins on the colours of β Cygni, 67
his sidereal spectra, 67
Huyghens’ 600 power, 60
Hypothesis on the Nebulae, 86

I

Illuminated fell deceitful, vi.
Imperfections of sight and instrument
must be noted, 25
Impossibility inadmissible, 55
Incidental and direct colours, 54
Initiatory remarks on colour, 13
Instrumental grades of colour, 52
advantages, 54

J

Jewels not definitive for colour, 13

K

Kirchoff on Bunsen, 53

Kirchoff on light, 87
Knott on β Cygni, 61

L

Ladies may aid in naming colours, 26
Lassell advised to observe on Etna, 32
, his noble offer, 73
Lee on β Cygni, 63
L’Envoy, 73
Liberal offer of Dr. Lee, vii.
Light to be avoided in observation, 47
Limits of latitude for colour, 85
List of fancy colours, vi.
Lockyer, Sir. N. on β Cygni, 70
Low powers show most contrast, 90
stars to be eschewed, 46
stars show false colours, 47
stars to be avoided, 82
Lucky individuals, occasional, 66
Lusieri employed by Lord Elgin, 52
Luther on the elements of Hebe, 68

M

Macro-micro power, 60
Maia on β Cygni with Heliometer, 69
*Male light imparted by Sun, 37
Malta an inferior station to Etna, 32
, site of Lassell’s great telescope
observations, 73
Mariotte first wrote of blue stars, 17
Melbourne telescope, 72
Memory dubious on colours, 55
Mensuration of angle and position, vi.
Metallic diaphragm, effect of, 65
Metals detected by the spectroscope, 38
Milton’s male and female lights, 14
* male and female light, 37
Mira Ophiuchi seen by Hind, 20
Moon less likable to prismatic effect, 47
Mountain Astronomy, its origin, 32
Munich object glass, 59
Musgrave, Sir G. a good artist, 16

N

Nature must be studied for colour, 51
Nebular theory not upset yet, 86
Negatives occasionally useful, 48
Newcastle, Duke of, 72
Newton supported by Thallium, viii.
combated by Goethe, 44

Newton accused by Goethe of circulating
“nauseous precepts,” 22
recommended a high station
for observing froni, 32
“Noli me tangere” of old books, 74
Nomenclature, of colours, vi., 36, 41
Notions of old exemplified, IS

O

Object-glass sometimes deceptive, 25
from Munich, 59
Omniscient Creator to be studied, 77
*70 Ophiuchi, quoted as changing, 80
Optical pair as β Cygni, 56
analysis of the heavens, 83
Orange the warmest light, 37
Orange-coloured star, 68
Outlines of Astronomy quoted upon
colours, 17

P

Painting greatly dependent on the art
of colouring, 49
Paraffin-lamp recommended, 67
Parallax encourages great exactness, 45
Parsonstown not a coup-de-grace, 86
Pattinson telescope, 32
Pawsey, Rev. Mr. at Hartwell, 50
Perception of colours delicate,, 36
Permanent stars appear white, 44
β Persei selected by Arago, 45
Phenomena, all important, 77
Photologists, their language, 36
Photosphere of the Sun, 88
Physical real colours distinguihed, 25
change when to be reasonably
suspected, 85
Physicists can measure light-waves, 41
Piazzi how to be included, 65
Planetary colours interpreted, 18
Pliny quoted on light, 37
Pogsn confirms R, Geminorum, 20
Popular description of Mr. Huggin’s
spectra, 87
Portable form of suggestions, v.
*Postal reform by Sir Rowland Hill, 6~l
POSTSCRIPT, 86
Practical vigilance recommended, v.

Primary colours in nature, 36
Prismatic important discoveries, 37
Prismatic effect, upper and lower, 47
*Probabilities, theory of, 66
Procyon and its remarkable missing
companion, 68
Prophets threatening the destruction of
the world, 88
Ptolemy aware of refraction, 82
Pulcherrima, not all binary, 56

Q

Questions are easily propounded, 19

R

Ramsden, 111 power, 60
Rasalgeti shows mild tints, ix.
Radius of velocity of light, 38
Red the most exciting color, 37
Reddish stars next to white, 15
Reductions regarded monotonous, vi.
Reflector for Australia, 72
of sliver on glass, 62
Refraction from horizon to zenith, 46
of the atmosphere, 82
Refrangibility of various colours, 87
Register of β Cygni, 56
R. Geminorium, passes through all the
colours, 19
ranging from 7th to 11th
magnitude, 21
Rememberance of colours peculiar, 51
Reminder of discrepancies, 42
“Rem vidi, causam non vidi,” 77
Rock-salt prism applied to a star,
Roman college broken up, 24
Rosse, Earl of, on β Cygni, 56
cautious on the nebulae, 86
Royal Academy boasts of very few good
colourists, 51
Royal Society, paper by Mr. Huggins
on spectral lines, 88

S

Scarlet mistaken by some eyes, 71
Season for arranging co1ours, vii.
Senstiveness of some persons above
others, 49
Sestini on colors compared, 23

Sestini’s method observing, 24
’s anomalies noted, 31
α Centauri’s companion, 39
on Cor Caroli, 50
Shades of colours omitted, 55
Sheepshanks equatorial, 32
Silver-on-glass reflectors, 62
Sirius, the ancient rubra canicula, 16
- yields a rich spectrum, 68
*Smyth, C.P. quoted, 66
on 95 Herculis, 78,79
on reflection, 83
Solar light our usual test, 39
Sources of error in observation, 46
South latitude, there effect on colours
tabulated, 83, 84
Southern heavens to be studied, 73
Spectra of stars very important, 40
of planetary nebulae, 87
Spectral spaces due to interference, 87
Spectrum analysis of colours, viii.
Spectrum observation difficult, 53
apparatus as employed by Mr.
Huggins, 67
Speculum Hartwellianum quoted, 23
quoted on 95
Herculis, 78
quoted on the
nebular theory, 86
Standard reference required, 48
Star scrutinized from Teneriffe, 33
Steinheil 323 power, 60
Stellar physics now advancing, 54
velocity by Sestilli, 39
Stuve, his estimates of colour, 14
on 95 Herculis, 78
Sudden appearance of a star, 43
Summum bonum of knowledge, 74
Sun less liable to prismatic effect, 47
Sun’s light compared to the stellar, 39

T

Table comparing Smyth and Sestini, 26
of β Cygni, 556
of colours in various latitudes set
forth, 83, 84
Talmage on β Cygni, 69

Teneriffe experiment in astronomy, 32
and Bedford observatory colours
compared, 33
Thallium, mono-chromatic green, viii.
Theorising, the time not arrived for
safely indulging in it, 31
Theory converted to fact at Tenneriffe, 32
of the velocity of light, 39
of the universe may possibly
be aided by colour, 48
Thomson, his description of colours, 23
Three primary colours in nature, 36; the
averment of this fact startled
neophytes, 22
Tints preceding extinction, 44
Transmission of light, 40
Transparent bodies reflect and transmit
rays of colour, 41
Tremors to be avoided, 32
Tropical refractions, 82
Tulse, the observatory of Mr. William
Huggins, 87
*“Tyndall on Heat”, refer to, 88

U

Undulatory theory “deserves to be
true,” 41, 87
Universal physics includes variables, 20
Uranography of the south, 38

V

Vapours, their phenomena, 82
Variable star Atlas in progress, 21
star of 1572, 45

Variable stars considered, 18
Variation in some, 42
Velocity of light by various authors, 37
Vexula questio, Are colours material, 49
Vibrations of light, 37
of the air by light, 88
Victoria, colony of, detemines to have
a telescope, 72
Violet ray arrives first, 42

W

Water-colour, can imitate the stars, 48
Waves of light explained, 87
Webb on 95 Herculis, 60
quoted on 95 Herculis, 81
*Whewell on Spec. Hartwellianum, 43
White stars most numerous, 15
beam is composed of many
coloured rays, 40
ray is esteemed to be the last
and permanent colour of star, 42
star permanent, 41
Wollaston and Frauenhofer, 53
Wrottesley, Lord, on star tints, 35
on β Cygni, 65

Y

Yellow ray of new star the second to
arrive, 42
of β Cygni, how estimated, 67

Z

Zahn on the colour of stars, 18
Zenith stars least liable to error, 46